Why did my post disapear?

[jjnettrouer]

I posted a reply, and now it's gone. It isn't even counted in my user profile anymore. So much for contributing!

[AnyOldName3]

There's something in the moderator logs saying there was a removal of a post you'd made with this reason:

Irrelevant post reviving old thread.

I can't see the post, so can't tell how irrelevant to the thread it was, but the thread was last active over a year ago and says at the top of the first post that it's out of date and no longer accurate.