The AI usage was not about learning German, but for creating an app. This would be group 2. He may use the tool he made to learn German, but using that tool isn't using AI

>using that tool isn't using AI

It is though. App is using AI underneath to generate audio snippets. That's literally its purpose

Creating those snippets don't require knowing how to make a proper recording, how to edit it down, or how to direct the voice actor for the line.