Marcus is of a school of thought that intelligent brain requires symbolic reasoning, not just a neural network. He also believes intelligent symbolic reasoning is attributable to a genetic origin and can’t be entirely trained. I don’t know enough to say the school is wrong, but it is in crisis with the successes of large language models.

George HW Bush built part of his folksy persona around hating the taste of broccoli. If one day he tried eating broccoli and enjoyed it, would he tell everyone? Likely he'd choose to keep his reputation and just keep his new taste to himself.

It's kind of his schtick. He pitched himself as an AI expert but hasn't really contributed anything much to developing AI, but gets a lot of coverage for saying this that and the other won't work. (see https://www.reddit.com/r/singularity/comments/1ajemjc/spoile...)