Alternatively, given that he's made his profession as well as place of residence known, looking for psychiatrists named scott alexander in that region also returns an official result.
If it took you days to figure that out I'm sorry to say you don't have a future as a private eye.
Results a few weeks ago may be nothing much like results now. (If it took a rando on the internet to point that out to you you don't have ... No let's leave that kind of garbage out, yeah?)
If your pseudonym is your actual first and middle name and you're relevant enough to be on the frontpage of google right now you're not being doxed, that's just public information at that point.