Assuming that the headline is there for just attention, all they are doing is hydrolysis with RF radiation. The only potential twist is the actual frequency. If they chose a resonant frequency for [salt] water, there may be a slight energy advantage. You would likely lose that advantage in conversion losses, but it could be there. (Resonant frequencies are really fun, you try to divide by zero. {constant / (c^2 - w^2)} where w is frequency in radians, and c is the resonant frequency.)
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