Code snippet to hide the comments and the comment form for all non-members

restrict_comments.php

<?php 

add_filter( 'comments_array', function ( $comments_flat, $post_id ) {

	$post = get_post( $post_id );

        // checks if the current post has any restricted content
	if ( false !== strpos( $post->post_content, '[wcm_restrict' ) ) {

		if ( ! wc_memberships_is_user_active_member()
		   || ( get_current_user_id() && ! wc_memberships_user_can( get_current_user_id(), 'view', array( 'post' => $post_id ) ) ) ) {
			$comments_flat = [];
		}
	}

	return $comments_flat;

}, 10, 2 );


add_filter( 'comments_open', function ( $open, $post_id ) {

	$post = get_post( $post_id );

        // checks if the current post has any restricted content
	if ( false !== strpos( $post->post_content, '[wcm_restrict' ) ) {

		$open = ( wc_memberships_is_user_active_member()
		   && ( get_current_user_id() && wc_memberships_user_can( get_current_user_id(), 'view', array( 'post' => $post_id ) ) ) );
	}

	return $open;

}, 10, 2 );