Hans Beekhuyzen measured it. You dismissed it as irrelevant. Yet, it is there. You believe it cannot impact the sound quality and it’s possible you’re correct. But, you disallow for the possibility that you are not correct. There is noise on the circuit. It can be measured.
Amir, the ASR crew and current fanatics have a history of exactly this. They will claim something could not possibly have any effect, then when a measured difference is shown, they will immediately move the goal posts to saying it’s too small to be audible, then demand double blind tests. This way they never have to admit being wrong.
They have been doing this since long before the current networking debates.