> there are no physical or info-theoretical limits that superhuman intelligence must require a megawatt-sized compute cluster and all the data on the internet (which obviously no human could ever see).

Much of your "intelligence" is a function of natural selection. This is billions of years X bajillions of creatures in parallel, each processing tons of data at a crazy fast sampling rate in an insanely large/expensive environment (the real world). Humanity's algorithm is evolution moreso than the brain. Humans learn for a little while, start unlearning, and then die — which is an important inner for loop in the overall learning process.

Taken together, there is some evidence to suggest that superhuman intelligence must require megawatt-sized compute cluster and all the data on the internet (and a lot... LOT more)