Comments on tags which no longer appear on any words also act as ghost comments of a sort: I can see on the recent comments page that bilby has commented on /tags/cyncism, but when I go there I find a 'nobody has used' page with no comments (and no comment entry box) visible.
I think I've previously mentioned this on either bugs or features.
I added simip to the Wordie Paradox list, and the list page says it 'has been listed 3 times with 55 comments', so it seems still to be associated with multiple lists as well as (ghost) comments; it's just the actual page that's been nuked.
We do have something like ghost comments. If you go to more searches and under comments type simip, you will see snippets of a large number of comments made on the simip page. If you try to go to the page, however, it's 404. From memory, the simip page was 'dealt with' as it was created by a spammer.