The thing about leaving guestbook comments -- especially when you know well and good that attacking PA on Alien Enigma's guestbook isn't going to do any good, and is going to fall on deaf ears -- is that it's one thing to do so, if you sign your name, but quite another when you hide your identity.
When you do something like that anonymously, you're behaving like a troll. It fast becomes clear that your motive is primarily to stir up muck and provoke hostility.
AW has a longstanding policy about trolling on PA authors' guestbooks and blogs, etc.: It's not tolerated. That's not open for discussion.
As it happens, the IP did conclusively match that of a member -- Zizban, who had every opportunity to own up, who knew very well about the policy, who instead attempted to obfuscate the issue -- and who is now banned.