Oh yeah, I don't think anyone should claim to be effective or rational, per se. Fwiw the original Sequences make it very clear that a rationalist is supposed to be somebody who pursues rationality, rather than possessing it.
So you say it should be possible to avoid making this claim. I agree, and I believe Eliezer tried! Unfortunately, it was attributed to him anyway.
Right. And I think that using "Rationality" as a name for the movement as opposed to its goals does amount to making that claim, which is one reason why (so far as I can see) EY never actually uses the word in quite that way and I don't think others should either.
So you say it should be possible to avoid making this claim. I agree, and I believe Eliezer tried! Unfortunately, it was attributed to him anyway.