I am sure the cables sound fantastic in the OP's system playing in his room. If the scientific explanation was only imperfect, I am sure we would all have pitched in to try and figure out the right explanation. But when someone argues that the moon is made of cheese, it's difficult to take things forward.
I get your point.
As I slowly creep towards adulthood, I have realised that not every argument has to be taken up and not everything that we perceive as incorrect on the internet has to be fixed. Especially in the world of audio and on an enthusiast forum (as opposed to, say, a peer review in a scientific journal).
Personally, I don’t think there are any notable sound differences in amps, let alone cables. If someone else thinks there are - more power to them. In the list of things that are wrong in the world, someone enjoying their music more for whatever reason (more refined hearing or placebo) is way down on the list of things to get bent out of shape over.
I’d rather use my time online to share my interest in audio with other enthusiasts and what they are excited about, rather than gnash my teeth and pick fights (I am not always successful, I admit, but I try).
In this case, someone has done something interesting with cables and while i don’t agree with their science either, proving them wrong is far less important to me than just sharing their passion. I can always just ignore the stuff that I don’t agree with.
TL;DR - just because one can, doesn’t mean one should.
YMMV.
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