They are a media outlet but it is not suppression. They are not stopping him from publishing that work and they are not stopping him from writing it. They are simply not taking part in the distribution.
Amazon is withdrawing these items from circulation.
They are not withdrawing it from circulation. THEY are choosing to not circulate it themselves. The author can circulate it where ever he likes as long as it is not Amazon. If Amazon was the only place that sold books I would be with you.