All of those were connected to Snyder's saga in some way though. Wonder Woman and Aquaman share continuity with Snyder's films but someone not knowing that could watch them and not tell. So yes there are connections, but it was never going to be a shared universe. Their own statements confirm that.
Johns:
Diane Nelson:“The movie’s not about another movie,” said Johns. “Some of the movies do connect the characters together, like Justice League. But, like with [2018's] Aquaman … our goal is not to connect Aquaman to every movie.”
True these quiotes are from after Justice League and Snyder's exit, but he was never the only filmmaker a part of it and they were always planning on doing one-off, unconnected stories"Our intention, certainly, moving forward is using the continuity to help make sure nothing is diverging in a way that doesn’t make sense, but there’s no insistence upon an overall storyline or interconnectivity in that universe," said DC Entertainment president Diane Nelson. She added: "Moving forward, you’ll see the DC movie universe being a universe, but one that comes from the heart of the filmmaker who’s creating them."
They've said this so many times and people still want to argue that it was always their intent