I don't remember exactly what you needed to sign up back then. That's around when I signed up for Coinbase, of course being a newbie idiot and not knowing any other place to go to buy Bitcoin. I don't think you had to upload any ID or anything, so likely just name, email address, address and phone number. So he probably definitely has alter egos he uses to not dox himself.

I remember reading once that Eddie Vedder of Pearl Jam said he used to use the nym "Wes C. Attle" (West Seattle) to maintain privacy.