The sheet is built from public RSS feed for this forum (The Stan Forums - Latest posts, via another, intermediary sheet for stupid technical reasons) which I’ve considered public data. It will not keep more than 2000 latest posts so it is not permanent either. However, I can totally filter you out if you don’t want to appear there.
Personally I’ve found this site preferable to Cross Validated for the stuff I want to do, but I am happy that other people are active there.