No no no, they, the buildings, the cluebox, and test track were at Unterturkheim. Sindelfingen is 12 miles away. The aerial shot was of Sindelfingen, but that was artistic license thrown in by the editors. Let's not get into this dicussion again and again. We got it right.
IIRC there were no overhead shots of the racers during this leg. So unless TPTB hired a helicopter to film JUST the Sindelfingen facility, we can assume it's just stock footage that they got from MB of a "generic" track.