I don't know this bit of trivia, sorry.
However, I agree with the skepticism. As a source of net positive energy this is dubious. It is potentially a lower cost way to generate hydrogen and oxygen for fuel cells. If the process can be made efficient enough one could envision a tank of salt water, a battery pack, and a compact RF generator, feeding hydrogen into a fuel cell to power a car. A lot safer than transporting high pressure tanks of hydrogen gas around. Probably would also provide longer endurance/distance than a battery powered electric car could manage. It is also potentially useful for higher efficiency desalination. But it seems very unlikely that it is giving off more energy than is put into the combustion process.
Of course, this will mean a lot more salt will be available, doing the world's bloodpressure and kidneys no good.