I think people are misunderstanding his post - he talks about decentralisation and how it is important, then about how innovations such as cryptos are using it.
The CEO of Facebook is not going to make a cryptocurrency just yet in my opinion, but may start to try and make Facebook more about giving power back to the people, by decentralisation. They may introduce cryptos when they stabilise, but they will not throw their platform in to it before a lot of testing the water with the underlying technology.