They apply to some degree, but it still takes X amount of materials to make each panel, you don't magically get more because you're making a continent worth of them. Even if you magically reduce the overhead 50% somehow, that's still only 18x which is not even close. Plus the fixed cost of making a laughably absurd amount of superconductor, and the monumenal logistics of deploying and maintaining all of it likely puts the project into net negative for a decade or two.

Saharan dust will also cover those panels in like a day. Probably makes more sense to float them on some body of water instead, with automatic washing and cooling?