SirPrimalform: There are plenty of nasty posts from Tauto surviving in other threads. I don't think it's possible to downvote something into deletion, I think that only happens if people misreport things as spam (which is apparently against the rules but it sound a bit hard to enforce if the forum autodeletes things).
Tauto: I've had threads and posts deleted in a matter of seconds,your theory is incorrect.
Correct. It is possible to delete other users' threads and posts. It is also possible to automate doing so. After my threads were subjected to such treatment I wrote and published the source code to a proof of concept piece of software that did just that. At that time (abut 14 months ago) everyone was fine with threads and posts being deleted, so nobody cared, not even GOG. I think that post of mine is still up on the forum.
At this point it's a bit outdated because it's using Phantom, which is currently deprecated, but the same thing can easily be done with headless Chrome as an automation tool, and will in fact work even better.
To be fair, I don't believe anyone is actively using such a tool, but there is nothing at all on this forum to protect users from it. The fix would be very simple — just removing the "Report as Spam" button, or at least removing the automatic deletion component.