Yes, OO (Original Owner) is always able to recover an account. It does not matter if an account has no email set or not. It is a myth that this decreases the chances of recovery, literally does not matter. What you do know if the account has no email set is that the password provided is the original password. But does not matter since you'll probably not able to recover the account anyways.
Don't trade this guy, he's trying to scam you