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You clearly didn't (and probably should) read his post explaining why he took the blog down. It literally says right there, that Scott Alexander is part of his name, but that the NYT would expose his _full name_ instead.

Even if he did broadcast his full name regularly on @slatestarcodex (which he doesn't), the main problem is in the other direction, as he and others have repeatedly noted. The worry is that people (i.e. patients) can go from Scott LastName to SlateStarCodex, not the other way round.

That's not his full name. IIRC Scott Alexander is just his first and middle name or something, and the journalist was going to lay out his full name for everyone to know.