Disable comment for CPT

function.php

<?php 
function wpgeodir_prefix_comments_open( $open, $post_id ) {
	$post_type = get_post_type( $post_id );
	// allow comments for built-in "post" post type
	if ( 'gd_compt_coaching' === $post_type ) {
  		return false;
	}
	// disable comments for any other post types
	return true;
}
add_filter( 'comments_open', 'wpgeodir_prefix_comments_open', 10 , 2 );