You need to adopt my tagline it seems. He is putting in a turbine engine, 60K rpm to charge batteries in a big hurry, then shut off. This is not a diesel, but a jet engine coupled to a generator.
The H2 he claims wowed the GM engineers was just an H2 with a Duramax diesel dropped in it.
No reason for GM engineers to swoon.
The guy has yet to show anything new as far as I can tell.