Irrelevant. He is citing the Bishop of Rome in communion with the Magisterium.
I suggest the book, “With Open Arms” which has a valid Imprimatur.
From whom, Rembert Weakland? It's apparently an out-of-print booklet from 1995. There are plenty of more recent, clear and authoritative sources available for free online for anyone truly in search of the facts.
This is a debate, this is NOT settled Church law
Unless and until there is an official change in the current law, we are obliged to obey it as is.
I suggest to you that openly violating a Commandment is far more serious than a Catholic who remarries after a divorce, regardless of the circumstances involved.
Especially since you have NO right to know the details, and you absolutely have a duty to not bear false witness.