Indeed, Dieselgate is 10 years ago. If they would've suffered badly from it, we would've seen that by now. Sure, they've had to pay fines and compensations, but that seems to have been dealt with. In fact, you could argue the opposite: Dieselgate forced VW to drop diesel and switch focus to EVs [1, 2], earlier than they would've done otherwise, giving them an advantage over other European and American competitors (except Tesla). Of course, there are plenty of other issues they've faced since them (inflation, Chinese competition, tariffs, etc).

[1] https://www.forbes.com/sites/georgkell/2022/12/05/from-emiss...

[2] https://www.ft.com/content/a2c7ca01-461c-4dc2-8006-ec1d6b61a...