Dragon Age Inquisition: Trespasser

Has anyone here played the Trespasser DLC for DA:I? Gameplay-wise it's pretty short, single path and unoriginal, though your end game choices will offer some small variety. The main point of this DLC is the lore, and it answers most questions about the elves posed by the previous DA content.

The big question that the expansion leaves me with is this: What are the implications of this for the origin and identity of the Black City and the Old Gods?