Well, trial and error are scientific. But I think I know what you're getting at, and I, of course, have no mechanical or physical explanation, just theories and experiments. There isn't proof either way because every person and every situation are different. Sometimes it works, sometimes it doesn't. It's been tried on me, but did not work. That doesn't mean it never will. There are other things to it, though. For example, there are controlling techniques using certain sounds (and no, I'm not talking about kiaijitsu and all that) and words that distract and stop attackers. I guess that could count as a no-touch technique. Blowing in someone's face to distract can be effective, as long as it's not the only thing you have. Maybe (just maybe) the no-touch chi stuff works similarly. Maybe it gets energy going a certain way which makes other techniques easier, or maybe it doesn't but DKI thinks it might, so they continue to experiment. Who knows? But I think it's obviously still in the research stage. That's the science, and I'm glad someone's doing it. I don't know the guy, but maybe he doesn't care if it works, but he just wants to know. But what if it can be proven to work? It will help in fighting and in healing, so I say, experiment away and thanks for trying.
I will say this, however; GD probably shouldn't record such things and say that he can do things that aren't 100%, but that's a different issue about marketing.