

Out of curiosity I did a quick test with Sennheiser Momentum 4 using 1000 kbps flac and I personally couldn’t hear a difference that I wouldn’t call placebo. If I wanted to I could convince myself that BT sounds better. But there really was no difference in quality. Only the tuning might be slightly different.
One cause of a difference could be whether the headphones use their built-in DAC or the phone’s.
I don’t think it was supposed to be particularly helpful. It’s more of him sharing his passion with his audience. Which isn’t going to be interesting if you don’t care about him.