EKObject is now iOS 13+ only?

In the latest SDK EKObject has changed to only be supported in iOS 13 and up. Before it was supported in iOS 5 and up. This means if you try to build an existing app against the iOS 14 SDK and have a minimum target before iOS 13 - you won't be able to build anymore.

The online docs also have been updated.

1. This is a sudden change. There was no notice. Its not in the release notes?

2. Is this actually a change or a mistake?

Just trying to understand here.