The Baltimore Catechism (1891) states that a Catholic who marries before a Protestant minister will be “excommunicated”.
This is not done today, and has not been done for decades. The person still has committed a sin, but it does not carry the excommunication penalty under the canon law due to a change in the code. (Confirmed by acanonlawyer on another recent thread.)
It doesn’t matter if you think it “elucidates the underlying doctrine” more brightly to excommunicate people - it’s simply not a ground for excommunication now, and isn’t done.
The Baltimore Catechism (1891) states that a Catholic who marries a Protestant in the Catholic Church cannot have their wedding in the church or in the sacristy, cannot have a Mass, and the priest cannot use holy water, sacred vestments, or bless the ring.
Again, this has not been the case for decades.
I realize that some people will go to any lengths to try to make out that the Catechism hasn’t changed, but the fact of the matter is that it has. Significantly.
The truth of the Catholic faith has NOT changed, but how the Church chooses to express those truths in some cases has. And that change is what’s reflected in the Catechism.
This is my last word on the subject, because anybody who reads the old one and reads the new one gets what I mean.