At the time, Ben Affleck still planned to star in and direct a version of The Batman.
This, it seems, set the table for what would have been The Batman under Ben Affleck’s direction.
While that movie isn’t going to happen, the Snyder Cut did set up the movie that was ultimately scrapped.
During the production of Justice League, Ben Affleck released some now-infamous footage of Deathstroke, revealing that he was going to be the villain in his solo movie within the DCEU.