Hmm, I clicked that link and the first claimed bad prediction I see, from 1996, is "singularity 2035 (actually 2025)".

Predicting 2025-2035 as, at least, the period when AI becomes a really big deal, seems pretty good, even if the jury's still out on "singularity".

Broadly, the rationalists seem to have been pretty early to realizing LLMs were a big deal, and certainly seem to have had a much more accurate picture of how they'd develop than the people who denounce "TESCREAL" and talk about "stochastic parrots". It's fair (and IMHO correct) to ding rationalists for lots of things, but specifically poor prediction about AI seems like a bad one, insofar as anything has been tested so far.