I was under the impression that "alkoholfrei" / "alcohol free" could be up to 0.5%, whereas 0.0% really needed to be without any alcohol. Your link is only about the first case, if I read it correctly. They do state though that "without alcohol" should really be without.

Edit: further research seems to indicate that it is unfortunately not quite clear and you are correct: ". Sobald der vorhandene Alkoholgehalt mindestens 0,05 Volumenprozent beträgt, ist die Angabe „alkoholfrei“ um die Angabe „(< 0,5 % vol)“ zu ergänzen." - https://www.gesetze-im-internet.de/weinv_1995/WeinV_1995.pdf -> only once you exceed 0.05% do you need to declare <0.5%

Very disappointing indeed. Why not have them call it <0.5% and <0.05% and have the customer take an informed decision? Of course because the industry then says: "Dear government this is too hard, let us deceive the customers 🥺"

So 19yr olds shouldn't be advertised to? What's the cut off?

I actually fully agree that all advertisement is awful and support removing it entirely.

But lacking that, I don't see an issue with advertising universally. And if we're going to restrict advertisement to children, target actual children. "Teenagers" includes people legally old enough to join the military and kill other humans.