showPrivateButton error in VueJS tutorial?

I’ve been following the VueJS tutorial and in 10. Publish and subscribe
I’ve run into a problem where the Show Private button is not being displayed. I think there is an error in the tutorial since nowhere in the scripts section, item privacy is actually toggled nor is the showPrivateButton boolean value is set.

I copied the code for the tutorial from the github repo and same thing.

Am I missing something?