At least that explanation offers a good ending to Batman (1966) and Wonder Woman (1975), they have survived after the Crisis.
I guess The Flash's Earth-90 is definitively gone, because it was destroyed as a "test" by the "good" Monitor in 2018's Elseworlds (and because it's part of its story arc and it caused that 90 Flash's beautiful sacrifice scene in Part 3!), so it remains:
- Earth-F: Superman (1941-1943)
- Earth-203: Birds of Prey (2002-2003)
- Earth-DCEU: DC Movies (2013 -)
- Earth-666: Lucifer (2016 -)
I guess that for the two first Earths, we won't know until an official confirmation; and for the last two, if a DCEU movie and/or if an episode of Lucifer's Season 5 takes place in January 2020 or after, so Earth-DCEU and/or Earth-666 is part of the New Multiverse?