Some cable are indeed better than others. It's all about the quality of the shielding and the quality of the wires. Take USB for example; the data certainly needs to be shielded from the power.
I think he'd gain some credibility - as would most reviewers - if he had a reference setup and just substituted the component he's reviewing into it. Most reviewers have so many variables floating around every time they listen, who knows what's causing the sound? But, he's an entertainer.
He does have some interesting playlists on Spotify. You might find some new audiophile tracks you like in there. I did. I copy them over to Qobuz.
I can't get past his video titles to actually watch something. He looks mostly annoyed and ready to shake his fist at the kids in his yard. Anyone can get a YouTube channel.
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