I don't care much for the inconsistencies Sceleritas may have brought with his comment, but I do think the evil endings are clearly phoned in and written without any interest in them, just trying to get them out of the way.
I want to add that it's not even just comments that Sceleritas made, but also dialogues you share with your romantic partner as Chosen Dark Urge, and the prophecy made by the Bhaal priestess if you're romancing AA
If Dark Urge comments that their partner holds the key to immortality, the Bhaal priestess gives the prophecy of AA and Dark Urge dying in each other's arms, at the end of days, when the sun explodes. Apparently that's not even an option now. The only options are to just kill your partner immediately or make them run from you for now, basically with the promise of hunting them down to kill them later.
