So there's demo app in the eu-digital-identity-wallet/av-app-android-wallet-ui github repo, I believe this is what's being tested. This is obviously not an app for an end user, it looks more like a template, to be implemented / integrated on the national level.
There's also this controversial requirement for attestation / google play integrity / tpm on the device. That's not implemented in the demo app, in fact the twitter video linked in the article clearly shows security researcher launching a total commander android app with super user privileges.
IMO selling this as an "EU age verification app" by the commission is dishonest.
edit: so in the linked twitter thread, the security researcher is aware that this is demo app. So not only commission here is being dishonest...