User blog comment:Kajune/Lucifer, first son?/@comment-27460953-20160407212805/@comment-34326521-20160408060207

Well, the retcon concerning Reapers was also shown on-screen with one little comment by Dean, and given that a Reaper has been possessed by a friggin' demon, not to mention that when an Angel had problems finding Castiel because of his Angel warding, he called a Reaper, I'm sure nobody thought the writers would change that as well. But they did, and it was done in the exact same manner. One little comment from a character. In this case, it was God's sister herself, who was actually there, rather than a hunter.