Due to my recent visit to the awesome Mercedes museum, I thought of it as car reference... Especially considering that we're speaking about cars...
Autostadt in Wolfsburg is also worth a visit though I am not sure if you can book a visit to the factory anymore.
They're a manufacturing powerhouse. It's a joke referencing that Tesla is head to head with BMW/Volkswagen et. al. and is setting up in their backyard.
tbh I would not have leapt to assume that was a Hitler reference. Germany is indeed famous for its factories.