I would question Tesla on this. The change from the 8 yr / unlimited to 8 yr/150k miles didn’t happen until Mar 2020. Here’s one on-line article published at the time about the change.
www.electrive.com
I seem to recall you are buying this car private party based upon another post? If so, have them show up the car in the app on their phone. If you scroll down to the very bottom and you will see a specs and warranty link. You can from there go to a warranty screen which will show you how the car shows in Tesla’s system.