I doubt this. It's probably quite high but there is a limit to how much compute you can genuinely use. Just like there's only so much water you're gonna use even if you greatly enjoy Californian almonds.

However, there's probably no limit to energy/electricity we can usefully allocate. And therefore yes, we should in fact provide as much as possible, Dyson spheres and all.

How do you figure that? And if it exceeds what we can generate, a very big number is as unsatisfiable as infinity

Dyson spheres are science fiction. Science fiction is fiction.