No, its not proof. In fact, I have found bitlotto.com to be the only time
bitcoingames@hotmail.com was used to register a site.
What I did was check bitcoingames.com , .net and .org
Those are the names I have and it proves nothing. That was why I did not want to post them here but I thought others might know something I do not and be more helpful.
My $0.02: if he was smart enough to hide himself for the initial registration then I highly doubt that any other registrations would be his. Especially considering he already had the identity in place.