You either missed the significance of the following connecting argument or you didn't want to deal with it.

"Concerning the first dubium posed by the four Cardinals in November to Pope Francis, the question that is being posed is whether or not someone previously validly married, and who now is living with another partner, may be absolved from sin without having to live as brother and sister, and therefore may also receive holy communion. This is in contrast to the teaching of Pope St. John Paul in Familiaris Consortio, 84, Reconciliatio et Paenitentia, 34, Sacramentum Caritatis, 29. Whereas Amoris laetitia (hereafter AL) 305, footnote 351, seems to abolish the teaching, and allows for freedom of the second couple to have intercourse for the sake of a long-term faithful “invalid marriage” that has children to raise."