I think "no roof rack" is similar to "no towing with the DSG." A suggestion, but you can still do it.
I don't know they are pretty explicit:
"For technical reasons, the vehicle body is
not designed to carry a roof rack. Never mount a roof rack on your vehicle. Mounting a roof rack will do considerable damage to the vehicle.
WARNING: Mounting a roof rack on the vehicle can cause an accident and serious personal injuries.
WARNING: Never mount a roof rack on the vehicle.
WARNING: A roof rack could come loose while driving and fall off the roof of the vehicle.
NOTICE: Installing a roof rack or carrier of any kind will cause expensive damage to your vehicle that will not be covered by any VW Limited Warranty.
But on the other hand if Rhino is selling a roof rack that they say fits the car then I would think it would work otherwise they would be spending a lot on compensation for damaged cars?