This forum regularly deletes posts. Most times, it's legit (cussing, bullying, using real names, etc), but sometimes stuff just disappears. It's a regular occurrence. I have re-posted things that have been deleted and oftentimes, they will stay up the 2nd time.
There are automated bots on this site that nuke stuff. I really don't think they have real people pouring over the thousands of threads, comments and words.