Wow. As a real live canon lawyer, where do I start? As much as I agree that Biden is in deep spiritual trouble with his pro-abortion positions, your post is factually wrong in more ways than I can count!
If you’d like to know what Catholic teaching really says on this subject, try reading this:
http://canonlawmadeeasy.com/2010/10/21/have-pro-abortion-politicians-excommunicated-themselves/
And please note that there is NO SUCH THING as “automatic excommunication,” nowhere, no how, never ever. It is canonically impossible because it is theologically impossible. The word “automatic” and the word “excommunication” should never be used together in the same sentence...