While I generally like James work and understand his statement, if I had paid for that video, would want a refund! IMO, the video lacks focus and is way longer than it needed to be. Really needs a professional interviewer/producer/editor to hone it down and improve the messaging (which am still unsure what it really is).
My takeaway was that they were trying to make a case for how are very biased by our perceptions and only those who are experienced with measuring and listening together are qualified to judge speaker sound quality. Anyway, as for my original question, the AH response seems to be that there are multiple unavoidable perception biases and not sure whether they have any discipline to try to manage them. If so, would not seem to be an approach that would produce consistency from reviewer to reviewer.
So, really appreciate you asking and hope it goes well. Understand if you reserve your opinion for now, but will be interested to see if others came away with similar takeaways as I did.