It is exactly as it says.
And a Catholic may be a bad Catholic but that doesn’t mean he stops being a Catholic, whereas someone who is not Catholic can be a very good person but that doesn’t make him become Catholic. Well, I think it’s important that it be said. Because that’s how it is.
The problem is when in the Catholic Church there are so many who are not just bad Catholics but are not Catholics at all.
The one who has aborted is a sinful Catholic, a bad Catholic. Whoever does not believe in the real presence is not Catholic. Even if he is a bishop.
https://www.infocatolica.com/blog/cura.php/2602041010-carnet-de-catolico#more47974