Here's something to think about; lets say we applied this theory to an automobile engine. Lets say that we retro-fitted the frequency generators to focus their beam either onto the electronic fuel injection rails, or, perhaps, just right on top of each cylinder in order to insure proper radiation for the change to take place. Lets say this created an explosion in the cylinder (just like gasoline would) with the (common) use of a standard spark plug for the ignition. Lets say this fire/explosion was as powerful as gasoline and the engine turns as an effect (which, judging by the rapid burn, it looks more active than what gasoline in the same tube would act) then the engine would turn the alternator, just like in a gasoline vehicle, which produced the power to run the generator. EDIT/Insert: The saltwater would be loaded into the fuel tank just as usual. There would also have to be a substantial battery charge in order to build the initial current needed to cold start the engine.
This is highly possible because you can acquire alternators with EXTREMELY high output (to run all these high wattage subwoofer systems, for instance) that would certainly have enough power to run a radio frequency generator (basically the same thing as a radio broadcast tower - the strongest of which run at dozens of thousands of watts; which is capable with high output alternators, and surely, the generator wouldn't require any more current than a standard broadcast tower). The variable in all this is just how many watts does the generating machine itself consume - and if it's too high, can it be re-designed, smaller, more focused (instead of the bulky, huge, surely low efficiency output plates we see in the video) unit that would operate within the output limit of the largest alternator setup any said engine would be able to rotate (also in respect to any power differences burning the saltwater would yield).
I think all this could be easily worked out, and I would love to get involved in something like this. I hold an Electronics Engineering certification and graduated autocad 3d design and engineering school - plus, mechanics are my hobby (ha, ha). I need to send a letter now.