Because he is one of a very tiny minority on the island that wants independence. The rest of us - over 90% of the citizens - want to remain part of the U.S. either through the current arrangement or through statehood. In fact, statehood won the last referendum on the issue last November. Another fact that escapes most people that do not live in Puerto Rico is the fact that most independence supporters, including the Archbishop - are hard core socialists and that’s why they are almost universally rejected here.
No future Popeship for you Gonzalez.
My point is that I statehood wouldn’t seem to be a matter for the Vatican’s consideration one way or the other.