Cars produced in the last seven days of the quarter is a somewhat gamable metric. They may or may not be sustaining production at that rate.

The good numbers come from DMV registrations. There are industry sources which collect that data weekly.[1]

[1] https://hedgescompany.com/automotive-market-research-statist...

While you are correct this is a very gamable metric, its nonetheless a good sign of considering the number of cars they were previously producing.