Audi disagrees with you here, they say to use anti seize paste G-052-109-A2 . It's supposed to be rebranded Castrol Optimol TA.
I have always used copper paste to prevent bolts from rusting in and they have never come loose.
I have sheared couple of bolts in the past on other cars undoing bolts where no paste have been used and bolts not touched for couple of years.