I don't get the whole concept of gravedigging anyway, besides the fact that it has nothing to do with forums at all.
If people don't want an old thread to be commented on, delete the thread entirely.
Threads aren't completely deleted very often. The point is that gravedigging, (perhaps you heard of it as necro-posting?) is just when an old thread that lived its puropseful life is commented on months after the last reply-
-bumping it unnecessarily to the top of the list and not providing anything useful to the thread discussion, as the thread is no longer relevant. Don't worry though, your post was in a forum games thread, which can't really go old as they'll mostly never be irrelevant.
Comments on Profile Post by Mineterria