If I understand correctly, all of the cars tested (including the petrol one) exceeded their NOx ratings by at least 60%. Of these, the VW was actually the second best after the petrol one. The older Audi model they tested didn't fair as well, but it still did better than the BMW, Opel, Volvo, or Fiat. Going off of that, it would seem that VWAG was unfairly singled out.
"it would seem that VWAG was unfairly singled out"
If you look at the true numbers, yes. But VW has been targeted for intentionally cheating. And don't forget, some Audi engines are also inherited from VW.
