and I think at some other instance as well.
I'm not aware of any other public instance. If he's alive, it's possible that he might have continued communicating with Gavin, Theymos, and others privately.
Yeah, that's an interesting thought I also had a couple of times before - do you think he may still be in contact with the "old" people or the core developers? Maybe he gives them hints on what to improve, but doesn't want to foster the cult-following...