if Amazon did allow paying with crypto, that would indeed be HUGE for cryptocurrencies.
I'm not certain about the legitimacy of that article, also why would Amazon need to pick up those domains:
amazonethereum.com, amazoncryptocurrency.com, amazoncryptocurrencies.com.

I don't think you see Amazon picking up domains like amazoneuro.com or amazondollar.com to accept those currencies, it makes more sense for them to add something about it in the payment section of their website...