I think your investigation does not make any sense, and I will explain why ... Looking through the history of airfinex messages, I noticed a few phrases in French, but obviously he speaks Russian and with all this he says goodbye in Swedish or Swiss (although I'm not sure what it is Swedish phrase). In addition, his frequent quotes with reference to Theymos' words about confidentiality as an argument make me think that this guy is not an idiot and added this ETH address just for a diversion. If so, then you wasted your time on this investigation.