Uhhhh, no.
This is the whole point of the debate between +Bellarmine and Cajetan (and others). The "practical" aspects of the law can only happen AFTER the authorities take action (i.e. declare and remove). Before the authorities take action, then we can only "theoretically" stop listening/resist such a heretic.
The debate still rages on 500 years later. It's not a settled question, so quit acting like it is.
Pax, this is not a debate between Bellarmine and Cajetan. We are discussing Canon Law. We were referencing 1983 Canon Law. But essentially the same concepts/processes are present in 1917 Canon Law. So this isn't simply a theological debate. It is the current law of the Church.
And when you say "AFTER the authorities take action (i.e., declare and remove)" you seem to be conflating those two terms. But they are different. The "removal" or "vacancy" happens automatically (
ipso jure) without any "authorities" taking any kind of action. It is a legal "removal/vacancy." The "enforcement" of the "removal/vacancy" is the thing that requires the "authorities to take action." If those terms meant the same thing, why would Canon law use two different words with different trigger mechanisms?
Here is the Canon 194 (1983) again. Read carefully:
Can. 194 §1. The following are removed from an ecclesiastical office by the law itself:
1/ a person who has lost the clerical state;
2/ a person who has publicly defected from the Catholic faith or from the communion of the Church;
3/ a cleric who has attempted marriage even if only civilly.
§2. The removal mentioned in nn. 2 and 3 can be enforced only if it is established by the declaration of a competent authority.
Here is the same concept expressed in 1917 Canon law in Canon 188:
Can. 188 Any office becomes vacant upon the fact and without any declaration by tacit resignation recognized by the law itself if a cleric:
...
4. Publicly defects from the Catholic Faith.
Canon 2314 §1. All apostates from the Christian faith and each and every heretic or schismatic:
1. They automatically incur excommunication;
2. Unless they respect warnings, they shall be deprived of a benefice, dignity, pension, office, or other office, if they have any in the Church, they shall be declared infamous, and the clerics, with repeated warning, shall be deposed;
3. If they have given their name to a non-Catholic sect or publicly adhered to it, they are automatically infamous and, according to the firm provision of can. 188, no. 4, the clerics, having been warned unsuccessfully, are degraded [laicized].
So, the ecclesiastical office becomes legally "vacant" at the moment that the officeholder "defects from the Catholic faith." Again, meaning he has no legitimate authority in the Church or over the members of the Church. Any laws or decrees he makes are null and void. He has no legitimate power. And he is automatically excommunicated.
The officeholder's actual physical expulsion from the office (changing the locks) happens only after two warnings.