Excellent post. I don't have anything useful to add at the moment, but I am wondering if the second-to-last paragraph:

First, yes, some claims are more rational than others. Some people even do better at rationality overall than others. But the idea of a real person being anything close to an ideal rationalist is an extraordinary claim, and should be met with appropriate skepticism and demands for evidence. Don't forget that

is just missing a period at the end, or has a fragmented sentence.