//This code removes noreferrer from your new or updated posts
add_filter( 'wp_targeted_link_rel', 'my_targeted_link_rel_remove_noreferrer',999);
function my_targeted_link_rel_remove_noreferrer( $rel_values ) {
return preg_replace( '/noreferrer\s*/i', '', $rel_values );
}

//This code removes noopener from your new or updated posts
add_filter( 'wp_targeted_link_rel', 'my_targeted_link_rel_remove_noopener',999);
function my_targeted_link_rel_remove_noopener( $rel_values ) {
return preg_replace( '/noopener\s*/i', '', $rel_values );
}

//remove noreferrer on the frontend, *will still show up in the editor.*
function my_formatter($content) {
$replace = array(" noreferrer" => "" );
$new_content = strtr($content, $replace);
return $new_content;
}

//remove noopener on the frontend, *will still show up in the editor.*
function noopener_formatter($content) {
$replace = array("noopener" => "" );
$new_content = strtr($content, $replace);
return $new_content;
}

add_filter('the_content', 'noopener_formatter', 999);
add_filter('the_content', 'my_formatter', 999);