There are several serious misconceptions going on here, concerning stereo vs mono (some things that PS Audio guy says in the video just made me laugh out loud):
https://vstplug.com/new-equalizer-named-silverhawk/The biggest one is that the Beatles stereo albums were
re-mixed from mono! They were not, nor is such a thing even possible, for there is nothing to 'mix'. Even in mono recordings that were 'reprocessed for stereo effect' there was no 'remixing', just 'processing'. Nor were the Beatles recordings done 'in mono'. They were multitrack recordings (as almost all were then, and since), and two different
mixes were done from these - the mono and a stereo. The mono mixes sound better because George Martin didn't personally like stereo (probably because so many early stereo pop records were gimmicky ping-pong affairs) and personally oversaw the mono mixes. He left the stereo mix to others, and didn't care what they sounded like. Pretty sure I even read that they weren't done by EMI at Abbey Road, but in America at Capitol Records. The other reason they don't sound as good is that they were mixed from dubs, not the original multitracks. That and Capitol's pop engineers and equipment just weren't as advanced as EMI's. All this has nothing to do with an inherent superiority of mono over stereo, which is absurd. The only superiority of mono over stereo is the case of listening to a mono recording on stereo speakers; such recordings will always sound better on a single speaker of equivilent quality, for a variety of reasons I won't go into. With anything, there are great and lousy stereo recordings/mixes and the same for mono. But a
well-done stereo mix will always sound better than any mono mix, again for a variety of reasons (just ask Alan Parsons which he prefers). And a true stereo recording done with an actual stereo array of microphones will always sound better than a pan-potted stereo one made from multiple mono tracks - but such recordings are only practical with acoustic/classical music groups, not a pop/rock music group. A notable exception is the Cowboy Junkies' 'Binaural' album, which was actually made with a single binaural dummy head microphone, and no mixing.