Not a wrong comparison at all. His point is that Amazon was a place that sold books. They took risks and grew into a marketplace for selling everything. One mismanagement of their AWS development or platformization and things could be very different.
Peloton is a manufacturer of fitness gadgets AND a content provider of fitness classes. What they could grow into if they take risks is an open and interesting discussion.
Manufacturing a fitness product with streamed classes seemed to be tackling the hardest part of what domain? Sure they could try random things now, but where are they ahead of a media, robotics, car or e-commerce firm? Investors are quoted as thinking he doesn't know what he is doing so probably he shouldn't have built up staff with no new market to enter with an advantage.