Some of what he says is sensible/factual, some isn't. For example, CDs can only represent frequencies up to exactly half the Nyquist frequency, in the case of CDs, around 22 khz.
Recent research is showing that phase effects of frequencies above 22 khz, reproducible only in higher resolution digital recordings (or vinyl)
are audible by humans in the form of harmonics that influence phase in very audible frequency areas such as 10 khz.
Constantly, the limitations of human perception are underestimated. It was said for years that humans can't perceive frame rates higher than 30fps, however we now know that 60fps or even higher frame rates are easily perceived by humans (any serious gamer is well aware of this.)
There are still a lot of things we don't understand about the technology that surrounds us - electricity, magnetism, vacuum tubes, etc. What you read in an electronics textbook is
not the summit of knowledge on the subject.
Do audiophiles make a lot of unnecessary purchases, based on hype? Absolutely. However, they are an endangered species and there is a lot we can learn from them at the same time.
