That is what intrigued me with GR Research, they seem to be in both camps but it does make sense that the audio jewelry side is required to make enough money. And at the same time it is easy to get swept up in the "everything matters" camp. If I had enough room to have them far enough out from the wall the H frame woofers would be really high on my list.
I think Danny appeals more to the audio hobbyist than to the audio jewelry crowd -- the latter are people who drop $20,000 on a DAC that sounds no better than my OKTO <g>. But that doesn't mean that everything Danny says (or I say or anyone says) has a solid engineering basis, and there are certain questionable myths held by some audiophiles, including the myth of "high end" speaker cables.
Anyway, I just watched Danny's video and Amir's response. Danny makes a nice demonstration of inductive coupling, and that's a real issue, but it isn't RFI; rather, it involves baseband audio frequencies and the remedies for the former (cable separation, shielding, twisting, running cables at right angles, and balanced lines, off the top of my head) are different than they are for the latter. So I agree that he hasn't made his case -- besides which, I don't understand the business of wires crossed at right angles within an audio cable -- has anyone measured the reactance of this thing?
On the other hand, I thought that Amir went a bit too far in minimizing the issue of RFI. It's a common problem in audio circuits, even if we ignore the unfortunates who hear WABC through their dental fillings. When it does occur, the manifestations can be obvious -- a radio station demodulated by a transistor junction, buzzing -- but not always. And RFI could potentially sneak past the Zobel network and get into the feedback loop as Amir suggested.
I read an interesting article on the effect of RFI on audio amplifiers in the AES Journal decades ago, but can't find it in a search. Maybe someone remembers what it's called. Meanwhile, here's an interesting article in EDN that touches on some of these issues:
https://www.edn.com/rfi-keeping-noise-out-of-your-designs/
That said, I doubt that a speaker cable that filters RFI is of use, even when RFI is an issue.