Naah, it was rather a PR-joke. BMW is not as good in calssic spare parts than Mercedes Benz or Porsche.

At Porsche it's possible, that you send them a single VIN-number-plate and they build around that VIN-number a complete car.

You can do this with other cars, too, but not with the supprorting of the company. You only have to know the people, who are owning the parts.