It's a proposition with a truth value in a sense, but if we are disagreeing about the topic then it seems most likely that the term "one of the world's foremost intellectuals" is ambiguous enough that elucidating what we mean by the term is necessary before we can worry about the truth value.

Obviously I think that the truth value is false, and so obviously so that it needs little further argument to establish the implied claim that it is rational to think that calling Eliezer "one of the world's foremost intellectuals" is cult-like and that is is rational to place a low value on a rationalist forum if it is cult-like.

So the question is how you are defining "one of the world's foremost intellectuals"? I tend to define it as a very small group of very elite thinkers, typically people in their fifties or later with outstanding careers who have made major contributions to human knowledge or ethics.