I know we have discussed this before, but this makes no sense to me. It is not like VINs are randomly going back and forth. There are typically within 10k range. I don't know why a public company needs to "hide the numbers of cars sold during a QTR" but this is not a good way of doing it.
It is more likely VINs get assigned to production batches based on config, and as they produce cars for these different config you will see VINs differing by 10k or more being produced on any particular day. I don't know anything about automobile production, but this makes more sense to me than "Tesla wants to hide the numbers".