It takes 2-3 months from Germany to the US. So anything sold in Q2 was produced in Q1 (or earlier). Also I’ll bet you that Q2 production is normal when they announced results in May since they say 2021 deliveries will be “Significantly up on previous year” 
For Porsche it’s more like the TP issue , stores didn’t run out because production stopped but because people bought more. There are certain makes that reduced production but Porsche is not one of them.