Safe to remove this: when using a 3rd Party Comment App? [closed]

From the Disqus plugin core:

// Only replace comments if the disqus_forum_url option is set.
add_filter('comments_template', 'dsq_comments_template');

Which certainly implies that Disqus uses the <?php comments_template(); ?> include to include it’s own files, so I would advise leaving it where it is 🙂