Google has a pretty good legal team. Their developer ToS that absolves them of any sort of liability for anything. So this means VW is just being lazy and not seeking legal protection.
This is... obviously not true?
If you could (somehow) meaningfully damage a car via the app, do you think VW wouldn't be liable because of the Google Play developer ToS?
[]: everything may very well not be a thing but people like to pretend it is
Maybe they rather be lazy and be able to shift blame, even without much legal recourse.