Banned accounts can still post, but their posts aren't seen by for most users. Only the ones with 'showdead' turned on in their profile see these comments, plus the author of the post. Does that make sense?

If you sincerely want to use HN as intended, as described at https://news.ycombinator.com/newsguidelines.html, you're more than welcome to email hn@ycombinator.com.