i'm ignorant on car production line, but when they can release vin's this quick, I wonder if they already have chassis stocked, just awaiting for orders?
At Tesla, Vin numbers are database rows. They become real later on when a chassis is built and comes together. Tesla does this to prepare for exports, financing and other things. Also, it could be a mental lock. You are less likely to cancel an order if you know "your Vin" is out there. Somewhere. Most car makers issue a true Vin when a chassis enters paint.