If I read it correctly, the thief is now using his own AdSense Account. Consequently, Google is paying a thief, albeit unintentionally. I suspect Google might be persuaded to respond, but I wouldn't take that route right away. It has only been two hours since the registrar was contacted and it is their responsibility first. Google "customer service" is notoriously bad. If the domain theft is resolved, I could see you ending up in a position where Google somehow closes your account, thinking you were the thief.
