Well, it means complete really, not universal.
But in any case, Protestant and catholic are not are not opposits. Many Protestant groups understand themselves to be catholic, and always have.
Yopu need to learn the difference between what you think is true, and understanding what other people think is true. Tha Catholic Church doesn’t think Protestants are even Churches in the proper sense. But surely you understand that Protestants do understand themselves to be, and don’t complain when you go by a building that says “First Baptist Church”.
Similarly, Anglicans, Catholics, the Orthodox, Lutherans, just to name a few, all consider themselves to be catholic, and think that catholicity is an important part of the church. If you look at what they mean by the term, there are some differences but many similarities, and they can certainly understand each other’s language and intent.
Anglo-Catholics clearly have a position on this - they affirm themselves as catholic and there are many theological and political views they hold as a direct result. They are different from some Anglicans who are not Anglo–Catholic. And they might not call themselves Protestants, or if they did, it would be in the sense of standing against un-catholic, unorthodox practices, which is surly a catholic thing to do.