Seeing how "The Mighty and the Righteous", adventure 4 of Season of the Righteous, takes place in the Abyss, shouldn't "During this adventure" have something like:
All locations have the Abyssal trait.
("During this adventure" for Adventure Deck 4 "The Midnight Isles" does.)
As is, banes with the Outsider trait are still considered outsiders in some locations during The Mighty and the Righteous.