I’m not sure that is the correct take in the context of Comparative Advantage.
It would not matter if the SI could produce more than humans in a direct comparison but what the opportunity cost for the SI might be. If the ASI is shifting efforts that would have produced more value to it than it gets from the $77 sunlight output AND that delta in value is greater than the lower productivity of the humans then the trade makes sense to the ASI.
Seems to me the questions here are about resource constraints and whether or not an ASI does or does not need to confront them in a meaningful way.
Yes, all those conjectures are possible as we don’t yet know what the reality will be—it is currently all conjecture.
The counter argument to yours I think is just what opportunities is the AI giving up to do whatever humans might be left to do? What is the marginal value of all the things this ASI might be able to be doing that we cannot yet even conceive of?
I think the suggestion of a negative value is just out of scope here as it doesn’t fit into theory of comparative advantage. That was kind of the point of the OP. It is fine to say comparative advantage will not apply but we lack any proof of that and have plenty of examples where it actually does hold even when there is a clear absolute advantage for one side. Trying to reject the proposition by assuming it away seems a weak argument.