After reading the Science Guys review such as it was. I got the impression he was not interested in anything but himself. His results were claimed to be outside the threshold of human perception. I don't see why such people bother.
Silver allows push-pull because of the difference between it and copper. Which is audible as 'wholeness'. This After a reasonable time deteriorates because the other parts of the circuit compensate. Those darned electrons doing what they do!.
None the less I would not trust the sciencey map, because that is not good engineering

