Snyder himself once referred to his version of Justice League as an “Elseworld,” which calls back to the same-named DC Comics label that told stories outside of the existing canon.
The DCEU is in an interesting place right now, because while the franchise itself is moving forward on a path that sees movies like Aquaman 2, The Flash and Black Adam coming out, Zack Snyder’s Justice League provides the opportunity to explore an alternate direction this shared universe could have gone.