These recent updates have not been open to US cars in the FSD Beta queue. Especially for newer model cars. For instance, I have been nursing a 100 SS on my '22 SP and I have not been able to locate any similar model years on Teslafi or Teslascope.
That said, If the idea is to run limited test, but with a pool of cars that is representative of all their entire fleet, I can't grasp why it doesn't actually include the entire fleet.