I haven't deleted any threads about it.
It may have disappeared as a result of a spam attack, but I don't know of any reason why any of the staff would have deliberately removed the thread. We remove automated spam and duplicate threads, but very little else.
A few days back, before I did a little tweaking, we had a few bots that were posting over 200 posts each in the space of a few minutes. It's possible that one of your posts could have got caught in mine and oppy's attempts to clear all the spam out somehow. Sorry, if that's the case.
The other option is that the thread went invisible when a recent reply was removed. This can happen with BB2 forums, although only usually happens if an account is deleted (which is the reason we have to manually remove each spam post) or if a user becomes logged out at the same time that they're posting in a thread, though I don't think there's been any reports of that happening since the last patch, so hopefully it wasn't that.
Regardless, feel free to repost it and sorry for whatever happened.