I don't think you've read those quotes very closely? He's writing about all computer science problems. And "just about any short digital problem" is not the same as solving the world's problems.
AI ghosts can do a lot of things, but they're limited by being non-physical.
He does also say:
> The entire global economy is re-organizing around the scale-up of AI models.
> Software engineering is just the beginning; ...
> Air conditioning currently consumes 10% of global electricity production, while datacenter compute less than 1%. We will have rocks thinking all the time to further the interests of their owners. Every corporation with GPUs to spare will have ambient thinkers constantly re-planning deadlines, reducing tech debt, and trawling for more information that helps the business make its decisions in a dynamic world.
> Militaries will scramble every FLOP they can find to play out wargames, like rollouts in a MCTS search. What will happen when the first decisive war is won not by guns and drones, but by compute and information advantage? Stockpile your thinking tokens, for thinking begets better thinking.
So he is extending this to more than just computer science.