They are moving away from FlutterFlow, specifically. That could be a good idea since FlutterFlow is going to have a tough time versus agent assisted coding in Antigravity. However, going to RN is debatable. Flutter has a lot of advantages.
All low-code/no-code tools are competing against vibecoding on platform vendor provided tools like Antigravity. The vast majority will not survive. Indeed even without that competition a lot of of them just go out of business because they can't gain a large enough user community.
I've tried FlutterFlow. I might even be using it now for prototyping. But with coding agents in all the IDEs, why bother?