WB1900 is correct, even TOR doesn't help. You will be posting with a username, unless you signup with a new account every day.
Your posting content/history is what links you to your post. Some of the older threads are now locked, so your history can't even be 'sanitised'. Likewise, your handle is another clue, as most of us use similar names on different forums.
Anyway, I’m reasonably certain that it wasn't anything on Prune that ever got me in to trouble!