WordPress - disable warnings about a specific function

functions.php

<?php
//Since 5.3 WordPress spits out this notice:  add_submenu_page was called incorrectly. The seventh parameter passed to add_submenu_page() should be an integer representing menu position.
//I've fixed my own plugins, but it's still coming from a WP Engine mu-plugin which I can't fix or disable, and I still want WP_DEBUG_DISPLAY enabled so I can see other errors and warnings.
//Solution: apply_filters( 'doing_it_wrong_trigger_error', true, $function, $message, $version )


function mf_hide_annoying_notice($a, $function) {
    if($function == 'add_submenu_page') return false;
}
add_filter('doing_it_wrong_trigger_error','mf_hide_annoying_notice',10,2);