Seems to me (700 pages in, I've not read them all) that;
Sometimes there are audible differences, as in speaker comparison.
In that case it's reasonable that people can hear a difference and the challenge is to communicate what they hear.
Some people are better at hearing those difference, some are better trained to explain them.
When I worked in the traditional wine trade (regular blind tastings) it was easiest to communicate with the group I regularly tasted with, and harder with other people. Explaining something to 'interested amateurs', or trying to understand what they meant, was tricky!
There's a challenge to use clear and objective language, and avoid flowery fanciful descriptive nonsense.
We can work on that.
(That background, followed by working on clinical trial reporting for big Pharma, helped me adjust to ASR fast ... but I was still fooled for years regardless. I really should have known!)
The real issue is where there is no difference, or the difference is inaudible. That includes speakers reproducing the higher frequencies but is obvious for cables, networking, streamers, DACs and Amps operating in their comfort zones.
The challenge in the second case is to help others to accept that there is no difference. It's a big ask - of course they hear a difference, they really do. Undoing the learning of a lifetime is difficult.
Patience, repetition and a lot of resilience might be the best hope with that.
Two different issues; real differences that are hard to communicate, and false differences created by our biases.