Just becaue thats what you think doesnt make it true, its not my fault you either cant hear or afford to experience better sound. As far as the slap goes that wouldnt happen if you were not hiding behind a keyboard, internet alpha males are a dime a dozen, intelligence and bravado are both virtual.....not reality.
What he said was true if we are referring to modern amplifiers. Output biasing is done to improve efficiency. Yes, it also produces added distortion and that was meaningful in the tube days where distortion was and sometimes still is audible. With modern solid state amplifiers, the distortion generated by a more efficient biasing of the output transistors is inaudible. So while it might be higher, it doesn't matter since we can't hear it. Like most high end audiophile things, the manufacturer takes some audio issue that may not apply to the application in question and markets a product based on that. Marketing an amplifier because it has less inaudible distortion than one with more inaudible distortion is just one example.
Putting a 200 watt amplifier to drive a tweeter in a biamplified speaker system is another example of this sort of thing. Tweeters only need milliwatts yet people stand in line to biamplify them.
Assigning audibility to DAC's by blaming jitter, another inaudible phenomenon, is yet another.
Since it matters to you, let me say I can afford whatever sound I want and, in my high end audio days wasted six figures on high end audio gear. I've had my hearing tested by an audiologist and it is quite normal so I can hear better sound when it presents itself. While I think 100 lb. class A state amplifiers are cool, I wouldn't spend my money on one even though I could if I wanted to. I've owned a few and tested several of them and they provide no sonic advantage whatsoever. That's not opinion, by the way, that is bias controlled test results.