That would give Matt Reeves a lot more creative freedom with telling the kind of Batman story he wants and not needing to worry about it lining up with DCEU canon, but we’ll have to wait and see if this is indeed the case.
However, given that Warner Bros is willing to release Joker, a standalone movie not set in the DCEU, I can’t help but wondering if The Batman might also not take place within that shared universe, and Robert Pattinson’s Caped Crusader will be his own entity rather than a younger version of Ben Affleck’s Batman.