I think you're too harse in your criticism. His biggest faux-pas is presenting opinion as fact, but this a very common failing. That aside, here are a few excerpts I agree with :
"is often accompanied by a resonant peak, which can add ringing and a boost in level at that frequency. Therefore, designing a transducer to respond beyond 20 KHz. is useful because it pushes any inherent resonance past audibility"
"there is nothing inherent in gold that makes it sound better than a clean connection using standard materials"
I would also say to JCaudio, that, often basic theory does not explain all of the strange quirks of audio, but fuller theory, including, most importantly, the effects of real-world constraints and imperfections, will always explain audio effects. I get quite upset when people suggest that we should ignore the theory and use our ears. In fact we should do both ... use our ears then develop the theories, to back them up.
Also we should blind test more often. There are many subtle and unusual effects in audio that have surprised me, but there have been just as many "emperor's new clothes" over the years.