Gary Marcus has been a solid source of sneer material and debunking of LLM hype, but yeah, you're right. Gary Marcus has been taking victory laps over a bar set so so low by promptfarmers and promptfondlers. Also, side note, his negativity towards LLM hype shouldn't be misinterpreted as general skepticism towards all AI... in particular Gary Marcus is pretty optimistic about neurosymbolic hybrid approaches, it's just his predictions and hypothesizing are pretty reasonable and grounded relative to the sheer insanity of LLM hypsters.
Also, new possible source of sneers in the near future: Gary Marcus has made a lesswrong account and started directly engaging with them: https://www.lesswrong.com/posts/Q2PdrjowtXkYQ5whW/the-best-simple-argument-for-pausing-ai
Predicting in advance: Gary Marcus will be dragged down by lesswrong, not lesswrong dragged up towards sanity. He'll start to use lesswrong lingo and terminology and using P(some event) based on numbers pulled out of his ass. Maybe he'll even start to be "charitable" to meet their norms and avoid down votes (I hope not, his snark and contempt are both enjoyable and deserved, but I'm not optimistic based on how the skeptics and critics within lesswrong itself learn to temper and moderate their criticism within the site). Lesswrong will moderately upvote his posts when he is sufficiently deferential to their norms and window of acceptable ideas, but won't actually learn much from him.
Best case scenario is Gary Marcus hangs around lw just long enough to develop even more contempt for them and he starts sneering even harder in this blog.