"Distributed" was the point and the language their site uses*, not decentralized. It's only described as a convenience and reliability thing in contrast to the mess known as CVS. I haven't seen a note about avoiding one entity having too much power, even if that's a goal some users have in mind. Normally you have one master repo, or "blessed" as the site calls it.
It's like, a Redis cluster is distributed but not decentralized. The ssh protocol is not decentralized. XMPP, Matrix, and Bitcoin are decentralized protocols, first two via federation.
