What an stupid argument! Our reference is the Holy Bible, tradition and the Catholic Cathecism! It doesn't mean Catholic Church be a museum at all! Sin is always sin! Divorce was always hated by Jesus!
Jesus says 15 times that there is a risk of eternal damnation if someone persists in a grave sin, while Amoris Laetitia 297 claims that no one can be condemned forever because it is not the logic of the Gospel. Thus, eternal damnation would seem to have become a heresy.