I haven't seen JL Doom, but the way you describe it along with the Superman: Doomsday adaptation/and JLU episodes are close to what I think we're going to see. It'll be interesting to see what it turns out to be. If the pattern holds, there will probably be a behind the scenes feature on it with next weeks Justice League Dark release. If there is a stronger connection than we're thinking, I wouldn't be surprised if they focus on the murders row of artists that worked on it and just pretend the writer doesn't exist.