"Ah," says the optimist, "but we will clearly invent FTL travel just by throwing enough money and AI-hours into researching it."
(I've seen this 'enough money ought to surmount any barrier' take a few times, usually to reject the idea that we might not find any path to AGI in the near future.)
The claims that AI will itself solve the problems it creates are I think my favorite variation of this. I think it was Eric Schmidt who recently said well sure breakneck AI spending will accelerate climate change but then we'll have AI to solve it. Second cousin to Altman saying it will solve "all of physics," I suppose... and actually he said "fixing the climate" right before that.
This is way way less than the observable universe.