Yup, i spoke to VWOA about this as other dealers have done this to other 2019s so i asked if i can run this or request my dealer to change the oil spec and they responded without a clear answer that almost made me feel as though they implied if something goes wrong that specific dealer would be liable.
They got weird with you because it's an emissions and mileage rating thing, not because 5w-40 will damage your engine or that they'll deny your warranty. I will guarantee you VWOA has never asked for the oil viscosity that is in a car when approving a warranty claim. VWOA will never ever, ever, never, ever tell you that you can run anything but 0w-20 in a 2019 because they would open themselves up to lawsuits and regulatory action. After dieselgate, I'm sure they are the one manufacture that is ACUTELY aware of the implications of doing ANYTHING to affect mileage or emissions.