I was rather amused when I heard him make this statement. I think it must have been due to English being his second language or some such. He must have meant "powerful" generator. Any generator a fraction of the size of it's driving ICE can produce enough power to stall the ICE.
I am also somewhat confused by this stealth mode versus performance mode thing. It would seem that the battery chemistries appropriate for a PHEV (adequate cycle life) would also have more then adequate power density for max performance when in a pack large enough for 50 mile electric range.
