I was following that story closely and concur with most points. The media were not helpful nor was the web, but it is not likely possible to couple RF energy by simple absorption in the water. That is why we have 'ionizing' radiation (x-rays for example). But I wanted to add my observation from the videos I saw that ties into this thread... the work described started with making a gold(?) colloid that would couple with the RF for cancer drug delivery. Then, in a video, it looked like there was a small amount of colored liquid (consistent with a colloid IMHO) placed in the rf field. Then, without explanation, it looked to me that the water-turned-to-fuel may have had the dilute colloid added to it before the activation in the rf field. These small metal particles in the water may just catalyze the water dissociation in the rf field. As for efficiency, I too am dubious since such experiments certainly must have been done in the past century by others and become a curiosity instead of a process.