Earlier quoted context omitted.
Flutter, SwiftUI, Jetpack Compose: a whole lot of other platforms have been implementing React as their UI framework
No they are implementing Functional Reactive Programming, it isn't the same thing, even though common folks would say React. https://wiki.haskell.org/Functional_Reactive_Programming
If you ask the people who work on any of those frameworks I mentioned, they'll tell you they're taking the React style and applying it to their platforms.