Do system object delegates in ARC need to be set to nil?

An app crashes sometimes with error objc_object::release().

The Apple Developer Technical Support mentioned this:

Remember that you should always do something like _tableView.delegate = nil; in your -dealloc methods, even if you are using ARC. For compatibility reasons system objects use unsafe_unretained references to implement delegation, instead of the preferred modern replacement weak.

Does that mean that I have to set the delegates of system objects to nil when the view controller is about to be released?

class MyViewController: UIViewController {
   deinit {
      tableView.delegate = nil
      tableView.dataSource = nil
   }
}

I always assumed UITableView and similar standard objects are using weak references to their delegates?

Update:

It seems that the example by the Technical Support was outdated as UITableView has already been updated to a weak delegate. However not all delegates have been updated, e.g. the AVAudioPlayer.delegate is still unowned(unsafe). It seems that Apple is gradually updating delegates to be weak.

So as to whether a delegate has been set to nil manually can simply be determined by inspecting the delegate declaration in Xcode. If it is weak, don't bother.