It has nothing to do with when you were online or what your timezone is. When a thread gets deleted, all persons who posted in that thread loose all their posts from that thread.
Scarface deleted several threads a few days ago because they were breaking the Forum Games rules: no random spam threads and no "count to" threads. As for being warned that it isn't allowed anymore, he made a stickied thread in January in the Games section to say they were not allowed anymore
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He deleted only threads which were made after that. So well yeah if you made a count to thread in March and posted 500 times in it, you lost all those posts.