That video was shot for the GM 100th anniversary. GM Next was the theme back then. A number of cars from there and Milford were sold at auction since this video. Hendrick bought a few for his collection, that is more impressive that what you see in this video. Camera's are allowed in the Heritage Center, not at Hendricks.
The Heritage Center is open to a number of people either through open houses or private events. The Cadillac Biarritz and the white (65 I think) GTO (426 with the tri-power option) you really can't pick out in the video are a couple of my favorites.
Everyone can find a car/truck there they would love to have and they all look like new or better. BTW, they all do run and get moved around regularly to various GM locations.
Brad