If nothing else it shows those high end $1,000+ cables they buy are nothing but placebo effect.
In other words, they got fooled.
What’s happened in electronics is that there’s a cutoff, above which the audio quality doesn’t get any better, but that cutoff is much lower than anybody can believe. So the psychological cutoff is higher than the physical one, and a role of marketing is to raise that cutoff even further.
I feel the same way about wine. At a certain point, it's not really about objective improvements, it's about vibes and lore.
That said, think there is value in putting out facts that let people make informed decisions and not spend tons of money on things that don't actually work.
(And yet: They still make inexpensive cables in factories every day.)