Even if it is, I don't see why we should care. Facebook does not care about the privacy of users, allows advertising that is biased when it comes to race and gender. The article you've shared also raises additional data gathering concerns related to this payment system. The article does not say whether the coin is going to be centralized, but I think it's natural to assume it will be. Firstly, it is mentioned that Facebook might be negotiating with merchants in exchange for lower fees. If they can lower the transaction fees, I think it already hints centralization. Secondly, I don't think Facebook would risk with volatility associated with actual cryptocurrencies. Well, we'll see what comes out of it all.