Yeah. Maybe the DCEU is an alternate Earth-89 where only Batman and Batman Returns happened.Let's just wait and see I guess...two years from now.
If it's Earth-89 for sure, though, at least that explains the Joker being alive in that universe, it being Leto or whatever post-flash actor they might choose, and that the 1989 version was pahaps an inspiration for them, like Jerome was going to be in Gotham.
Edit: Nevermind, I read the article, only Batman and Batman Returns happened, thankfully.
I think that means this isn't Earth-89!