Excommunication and separation "from the love of God in Christ Jesus" are two different things.

Yes, there is such a thing as excommunication. Yes, Jesus advised using it. Yes, any Jew would have known what it meant.

Putting one's self ahead of the Church's teaching authority is a quick way to test your hypothesis.

https://www.ncronline.org/news/global/australian-priest-advocate-womens-ordination-excommunicated

The relevant Canons are  751, 1367, and 1369.