Display comment count on restricted posts for visitors without access

my_pmpro_show_comment_count_after_restricted_post.php

<?php
/**
 * Display comment count on restricted posts for visitors without access
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_pmpro_show_comment_count_after_restricted_post( $no_access_message_html ) {

	// get the post ID
	$post_id = get_the_ID(); 

	// posts only
	if ( false === $post_id || 'post' !== get_post_type( $post_id ) ) {
		return $no_access_message_html;
	}

	// get approved comment count for post
	$comments = wp_count_comments( $post_id );
	$approved_comment_count = $comments->approved;

	// Create and Add comment count HTML after restricted content message
	$comment_count_html = "<p><strong>$approved_comment_count " . ( 1 === $approved_comment_count ? 'Comment' : 'Comments' ) . "</strong></p>";
	$no_access_message_html .= $comment_count_html;

	return $no_access_message_html;
}
add_filter( 'pmpro_no_access_message_html', 'my_pmpro_show_comment_count_after_restricted_post' );