Also, posts by them have been deleted.
I clicked on that post’s alias on that board http://www.atomicbobs.com/index.php?mode=read&id=1037886, and it only has 2 posts to its name. If you click on mine, here, it has 9977. So, I don’t know how that is possible, the same alias having different histories. Also if I try to change password under that alias’ profile, the page is unsecured, which could mean it is not on this website and or is being monitored. On mine it is also labeled as such the moment you start typing a password.
In any case, the site here is hacked, at this point, so one could expect that even posts under your aliases can pop up elsewhere, but you wouldn’t have made them.