Is SwiftUI 2.0 backwards compatible with iOS 13?
Similar questions are asked repeatedly:
Unfortunately, none of them are not answered by Apple's engineer yet.
So, just some general advice.
Unless some sort of backward compatibility is announced, all the features marked as iOS 14.0+ in Availability part of the documents are not backwards compatible with iOS 13.
And, as far as I have checked, all the new features introduced with iOS SDK 14 beta are marked as Available iOS 14.0+.
Unfortunately, none of them are not answered by Apple's engineer yet.
So, just some general advice.
Unless some sort of backward compatibility is announced, all the features marked as iOS 14.0+ in Availability part of the documents are not backwards compatible with iOS 13.
And, as far as I have checked, all the new features introduced with iOS SDK 14 beta are marked as Available iOS 14.0+.