When people make alternatives to React, at some point they have to address the concept of state changes and side-effects, building in conveniences for it, or leaving it for third parties to develop this area.

... Or use something like Reagent where there is language level support for reactive state management using atoms.

https://github.com/reagent-project/reagent

That looks like exactly what SwiftUI is doing.

This has nothing to do with Redux. Redux is about storing global data, nothing more.