People like him and Zitron do serve a useful purpose in balancing the hype from the other side, which, while justified to a great extent, is often a bit too overwhelming.
I do think Gary Marcus says a lot of wrong stuff about LLMs but I don’t see anything too egregious in that post. He’s just describing the results they got a few months ago.
We may certainly hope Eliezer's other predictions don't prove so well-calibrated.