There's a difference between "infeasible given materials and manufacturing capabilities of the time" and "infeasible as a scalable solution due to the laws of physics"
The guy has to rent out his terrestrial data centers because he can't make use of them.
We probably don't need to pollute space with dead GPU's.
None. That is why they are...in practice... an engineering impossibility :-)
Nobody is disputing you can have a 1kW of compute in orbit...you have that in the space station. But that is a matchbox....