Even Hitler wasn't always wrong. He was well known to be very fond of dogs.
The point is that if you simply dismiss something because of who says it, rather than the accuracy of what is being said, then you it's a fallacy to say that the point is wrong. Does he engage in hyperbole? Sure, but it's not like we don't have more than our share of hyperbolic pronouncements by posters here. Perhaps Amazon isn't intentionally wreaking havoc on the publishers and main stream authors, but there is no doubt that the publishers and many main stream authors see that as the likely outcome of Amazon's drive to commoditize books.