Physical or chemical, does it really matter? We found here a big claim, and i don't think we should deny new theories.
I still think there is something else stan was talking about... in the end he clearly says that he can transform hydrogen into energy at 100% mass decay. But of course he worked thru many things in 30 years, i'm sure he might had used this system tut is talking about at maybe the initial time... later he was going to use the injectors only...