Wordpress WP_User_Query - Query by meta with random ordering

functions.php

<?php 
/*
WP_User_Query orderby random
put this in functions.php
*/
add_filter('pre_user_query', function(&$query) {
   if($query->query_vars["orderby"] == 'rand') {
       $query->query_orderby = 'ORDER by RAND()';
   }
});
?>

template.php

<?php
// WP_User_Query Arguments
$args = array(
	'has_published_posts' => array('post'),
	'fields'       => array( 'ID','display_name','user_nicename' ),
	'orderby'      => 'rand',
	'number'       => 6,
	'meta_key'     => 'featured_truthteller',
	'meta_value'   => 'yes',
	'meta_compare' => 'NOT LIKE',
);

// WP_User_Query
$user_query = new WP_User_Query( $args );
$users = $user_query->get_results();
print_r($users);

// Loop Users
if( $users ) {
	foreach( $users as $user ) {
		if ( count_user_posts( $user->id ) >= 1 ) {
			echo $user->display_name;
			echo get_avatar($user->ID, 300);
			echo get_bloginfo('url')."/author/".$user->user_nicename;
		}
	}
} else { 
	echo "no users found"; 
}
?>