No, VW do not use high idle, becuse with TDI it does not create as much heat to keep engine warm.
In cold climats VW use extra diesel heater (like Webasto or Eberspraher) to heat cooling system.
In my VW bus I have extra 5KW Webasto diesel heaterfor cooling system.
In user manual is warning (for cold temperature): do not let engine run in idle more than 5 min , it might damage the engine!!