[bagels]

The turbopump on its own won't do anything. The turbopump takes the 100k hp, and uses that to compress fuel and liquid oxygen. It's powered by the engine. It doesn't produce power on its own.

[gpm]

IIRC it's powered by a relatively small in size pre-burner - and I think it's fair to assume that he was including that pre-burner in his comparison.

[avmich]

Also known as gas generator, and while it's small, in Raptor two of them consume all (or practically all?) of both fuel and oxidizer in tanks.