That is exactly what these guys are saying in effect.
I've got a lot of respect for this old timer, contemporary of Rupert Neve, and an excellent audio designer:
Actually, in quite a few studies since, headphones turned out to not be of benefit in HFC being important to perception of audio quality ... strange as that may seem. I'd have to dig up a cite, but I clearly remember reading that in an AES paper because of "who woulds of thunk it?". :)
I agree with that ... AAMOF, it was the first thing I said in the thread. I am not a proponent of Monster Cable, but I do know from practical experience that every link in the audio chain needs to be designed to work together, and extension cord as speaker cable simply does not fill that bill. Good quality speaker cable, of the proper gauge and length for the application and components, yes.