I think it'll depend on how successful/well-received the Snyder-cut turns out. It's all about the bottom line for WB and from Snyder's POV, they did give him a ton of money to finish the thing - and if their relationship during the reshoots goes well, he might want to dive back in just for the vindication if nothing else. He got shit for "dark superhero movies" when Marvel was hitting their stride. And then "Joker" happened. So, who knows?