You’re absolutely right. Anyone who knew about the existence of both books would also be aware of the need to clarify which he meant (unless he was deliberately testing me so he could feel smug at his superior knowledge). The chances he was simply mistaken are still pretty good.
Had I considered that possibility, and rejected it on grounds of low prior, maybe I would have been entitled to a Rationality Cookie; but alas, what actually happened was that I didn’t think at all.
Wait. “Rationality Cookie” is that a real thing? I can’t find it but it sounds like a good idea to train rationality the classical way via quick rewards.
Not that I know of—but it could still work. I hear Eliezer once had some success with M&Ms!