There’s a simple test in this case:
Build your syllogism including premise being examined, state this premise as false.
Do the same thing a second time, this time state that premise as true.
If there is no effect on the conclusion, the premise is irrelevant.
Correct me if I’m wrong, but doesn’t Romanist theology make an argument that Immaculate Conception is a necessary precondition to Incarnation?
If that be the case then IC is a necessary premise for Romanists.
BTW, I know there are a couple of posts of yours I have not replied to.
Are you interested in my responding to the absurdity of political correctness or the theological issues, or both.