It's also worth mentioning that it's very hard to find working proxies for Wikipedia. You can spend your whole day trying a list of these, and the majority of them are already blocked. I'm astonished at how many of these 'open proxies' are blocked. To be honest, I don't like posting under my real IP address either, but I still do this. Even if he did 'accidentally' post with his own IP address, that's really too bad. Cry me a river, and it does not justify a moderator tampering with evidence.
I've edited with my IP address from home too, because I sometimes don't log in, or it's just a minor contribution I want to put on a page, and in the grand scheme of things, it doesn't matter. If I emailed them now and asked them to delete my logs, as they did with his, would it happen? No!
One thing that ticks me off about Wikipedia in general, is that some staff members are like the Nazis in Germany. Even if you post legitimate stuff on there, these "fanboys" or girls that have moderating power, well they only seem to want to add info that they will personally approve, regardless of whether it's really true. For example, a celebrity may do something pretty awful in reality, that warrants a mention under their "personal life" or "legal troubles" section, and then this moderator takes a totally biased approach to this other user's edit, being their precious #1 fan and in charge of their Wikipedia entry. Pages that I must stress, are open to anyone, and therefore, they won't approve the edit. Biased moderators shouldn't be allowed on Wikipedia. Yet for the low level pages concerning people that are still alive, but few members perhaps know of, it's like, "Oh, well. Carry on!"