So what you’re saying is that according to canon law every Catholic here on FR needs to be excommunicated because they debate about Catholicism?
Sorry for not seeing this, but the answer is basically no, since because not every Cath here debates about Catholicism, while as said, "as Rome interprets herself, what she said in the past only means what she says in the present," and what one does and effects manifest what one really believes.
Thus while at one time a lay person who engages in dispute, either private or public, concerning the Catholic Faith might be excommunicated, this (like so much of Catholicism) is subject to interpretation, and it is manifest that is not in force in the modern RCC.
As is,
Can. 831 §1. Except for a just and reasonable cause, the Christian faithful are not to write anything for newspapers, magazines, or periodicals which are accustomed to attack openly the Catholic religion or good morals;
clerics and members of religious institutes, however, are to do so only with the permission of the local ordinary.
No doubt those V2 RCs which attack the pope that their bishops elected would say they do so for a just and reasonable cause, while Traditional RCs who reject V2, or pick and choose from modern what they judge is valid or not (based on what ancient Cath church teaching states ) would reject this as able to censor them, and interpret anything ancient one this matter as not doing so. All the while censuring evangelicals for judging what is valid teaching based on the most ancient church teaching, that of Scripture.