>The guy was saying that AI was going to be a serious problem decades before anyone else was even considering it as a remote possibility
That's not accurate at all. AI research has been around since the 1950s and pioneers of the field identified risks early on, including Alan Turing, Norbert Wiener, and I. J. Good.
The problem with Yudkowsky is that he lays out elaborate doomsday scenarios with extreme confidence, except none of it is grounded in realistic physical constraints, timelines, or empirical data. It's all divined a priori from Yudkowsky's ad hoc "rationalist" principles.
Yah, another way of putting this is theory-ladenness of hyperreality of personal world model (rationality vs empiricism).
You are saying 1) other people have said the same thing and 2) you don't like the particular way he said it. Those can both be true, but that isn't even close to "consistently wrong with all their predictions".