He's using the Swift Playgrounds app on the iPad. The app is also available on the Mac App Store, and should work similarly.
literalPie
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Value of type 'NSPersistentCloudKitContainerOptions' has no member 'shouldInitializeSchema'
It's been 5 months, we are well out of beta, and I think the doucmentation is still wrong, telling you to set options.shouldInitializeSchema