Actually, I think I spent more than ten minutes on that video, having to replay a few bits to grapple with Ken's accent. Even so I'd still not feel comfortable attempting to paraphrase much of what he said. However I would like to point out a few things.
First, there are acknowledged tests, accepted industry wide, for measuring the performance of an audio component. If Ken is going to dismiss these tests out of hand as being meaningless or incomplete then it is incumbent upon him to explain and show why they are deficient and to fully describe his proposed alternative. In that video he did neither. Sorry, sighted listening tests are not an acceptable substitute for valid science.
Secondly, at one point he seems to be saying that mid and high frequencies (in audio terms) pass through a circuit more quickly than lower frequencies. I am completely at a loss as to how this can happen. I submit that an audio circuit neither knows nor cares whether it is passing a 100 hz signal or a 1,000 hz signal. If a midrange signal does pass through a circuit faster than a bass signal, how is it no one noticed it before Ken? Why hasn't Ken published a paper describing this effect? Why hasn't anyone else? This would seem to be a significant issue that circuit designers would have to address, yet I'm unaware of any reputable discussion of the matter.
Ken struck me as being an amiable guy and an inveterate schmoozer. Good for him that he's got such a good job. However, I'd be very surprised if he actually spent much time at the test bench while any of his "creations" were being designed.
Its a common misconception that he micro-manages the 'KI' gear - he made it clear to an Aussie journalist that he makes recommendations to each of the design teams at Marantz and lets them do their jobs. I assume he then spends time with the end result before letting Marantz ship the new 'KI', but that's all academic now that he has hung up his golden ears. Would you be happier if they released a 'Dr Dre' model ?
(and I agree that some of his explanation of how he 'balances' the sound across different frequencies sounded kinda loopy, but it wasnt helped by the drone from WHF agreeing with everything he said without pushing him for clarification. Clearly, English isnt his first language, but Marantz isnt asking us to buy recorded KI interviews)