You have a mishmash going on here.

Bindable is a iOS 17-only construct designed to work with @Observable elements.

If you're making your class conform to ObservableObject with Published attributes and you're using ObservedObject, StateObject, or (as shown) EnvironmentObject, you don't need Bindable.

You would in fact use it with Observable objects provided via Environment, but the code example purporting to demonstrate that shows EnvironmentObject.