hide the text “no comments”

simple, hide the text in all cases, commments or no comments:

.post-meta .post-comment-link { display: none; }

(via ‘Additional CSS’)

or more involved, remove the numner unless there are already comments;
add some coding into the child theme’s function.php:

add_filter(
		'twentytwenty_post_meta_location_single_top',
		function() { 
		if( get_comments_number() ) { 
			return array(
				'author',
				'post-date',
				'comments',
				'sticky',
			);
		} else {
			return array(
				'author',
				'post-date',
				'sticky',
			);
		}}
	);