@QS, sorry to interrupt here but I've got a question.
While you are stuck in the old-posts-deletion vortex and are interested to know why the posts got deleted by mods, I'd like to ask something completely opposite. Why can't I delete my 5-6 (even higher) years old thread(s) myself that I have created then? Is it compulsory to keep the threads even when there are options to delete our own posts in those threads? Is it also just limited to a few sections of the forum or all the boards are included?