By "massive non-comparative advantage" I meant he doesn't have a comparative advantage.

??? So you mean he has a massive absolute advantage, but is also so hugely better at other things compared to normal people it's still not worth his time??? Or does that actually mean that he has an absolute advantage of unspecified size, that happens to be very much non-comparative? What someone only vaguely familiar with economic terminology like me might call a "massively non-comparative advantage"?