Here's my armchair two cents: Whoever it is, has to be British. The language is unmistakeably British or Commonwealth. It's likely him. I'd wager if there was a polymarket bet. But I also feel for him. Does this make him a target for both half-wit criminials and rogue nation states?
It would be somewhat harder the other way (American pretending to be British) as American English is much more prominent, but I think I could convincingly pretend to be American in text if necessary if I was only participating in generally technical discussions (and nobody asked me about cultural stuff like NFL etc.)