Can you provide a link to where he has said that? I’m not an expert on Ed but I don’t recall ever reading him say that it is functionally useless, he doesn’t comment on its function, only the business, whether it has functional use is immaterial unless that generates value for the companies spending obscene money on hosting. The companies implementing AI as consumers can get a huge amount of value from it without a single cent going to any of the big labs, that’s part of why investment in AI infrastructure is so misplaced.

He often says in passing that he doesn't see value in LLMs outside of generating bad software and can help sometimes with search. But it's not really part of the AI bubble thesis itself IMHO, just him adding his personal commentary in interviews