Schumacher films are set in Earth-97
As Batman '89 explores the world of the classic 1989 Tim Burton film, the comic introduces a new take on the classic Bat-Family member.
That Crisis Aftermath thing was just a joke about the years. In fact, they said Batnipples is canon as a result of Earth-89, thus claiming Earth-89 as the Earth of Schumacher. The DC YouTube channel backed this up in their review of Catwoman, which also reinforced that Catwoman is connected.
While it is true that The Flash movie will not reference the Schumacher films directly, a UK company that makes vehicles for film production posted a shot of some Batman & Robin symbols. When I made several comments speculating the nature of their use in The Flash, they only liked my comments that it would be in Michael Keaton's Batman Universe (Earth-89), not the ones speculating I would be for another Earth in the multiverse.
It is true that Batman '89 is not meant to mesh with the Schumacher series. We'll have to wait and see on that.
If anything, it would be Earth-95. The writer for Batman '89 was vague as well. Probably thought about how their comic doesn't relate to the Schumacher films.
So really, it's up to The Flash.
In the case that they are seperated:
Schumacher = Batman 1-4, Catwoman and the novel tie-ins
Burton = Batman 1-2, Batman '89, The Flash