When I scan the qr code on my phone, it actually launched my country’s own eIDAS app. The EU verification app looks more like an application of eIDAS, data is stored on your national id card, that’s it.

The EU verification app is actually doing what you described for the German ID card, you get back a signed predicate “over 18” and that’s it. It’s also there for other legally meaningful ages, in a way you can you it to target the age a bit better, but you would have to issue many challenges to the user.

Is that a command and conquer reference?