Arguably BMW did not produce even the "absolute minimum number" of cars, since they were required to have at least ten cars to sell and only managed to produce

Arguably BMW did not produce even the "absolute minimum number" of cars, since they were required to have at least ten cars to sell and only managed to produce three production-level cars, which they never actually sold. There were a handful of other GTR Straßenversions made during development, but I doubt they even had VINs, and I'm not sure if even counting those would get them to ten. Hence the questionable uses of the words "launched" and "ten".