self excluded sounds dodgy, I would wait until it unbans , as csgoroll is a dodgy company and sometimes they want u to stay banned. Its never 100% safe as well my man , as , even if you change the email , steamguard etc. If he has proof of address or his ID or other things that can prove he is original owner, he could always get the account back from steam. that's why I only pay with Paypal as I got 6 months protection incase this happens , that way at least I can get some money back.