I took delivery of VIN 88XX in Portland Oregon yesterday. On the drivers side door you can see the month your car was manufactured. Mine was 3/18 so must have been shortly after the stoppage. Of note my VIN was assigned on 3/7/18 so that’s probably not shocking it was made in March. Its just above the GVWR.
I doubt that, Model S and X have PSIs all over the place between 38 and 51 PSI. If they were doing it for EPA testing they could just make all of them 44 PSI or 51 PSI depending on the tires sidewall max. Take for example