Paul McGowan is an embarrassing hack. As is the Chord engineer, something Watts, who claims people can hear "oscillating noise floors" down to -300dB, which I'm reasonably sure is the sound pressure you might measure at subatomic particle interactions.Lol, hmm you realize that's like saying you can shoot a better jump ball than Lebron James when you rarely shoot professionally, right? Or knowing how different various golf clubs at various price affects your game if you don't play golf, either? Or how much better a $500 bottle of wine tastes vs a $5 bottle, etc.
As for Paul McGowan, he's only a co-founder of PS Audio, a full-time engineer himself with decades of experience and who has listened to countless systems and cables day in and day out. In other words, the sheer amount of experience he has easily eclipses your so-called superior (doubt it) 21-year old hearing. Same with Gordon Rankin who literally revolutionized digital audio by introducing asynchronous USB standard to the audio world and he himself had said USB cables make difference after listening to 1000s of USB cables as part of his job.
In other words, why wouldn't I trust their words and their experience over yours?