He changed screen name, unlike username, which you can't change, you can always change your screen name, even if it collides. You can "try to" impersonate anyone on the forum that way, maybe something for the admin to think about.

Been checking your request, to deal 10 BTC with someone with reputation and fell to someone that registered today with 4 posts and 0 rep?!
Sorry that you go scammed, but it's like "you were seeing it coming".