I literally just left a car with 16,5XX miles about 2 hours ago, and there's still plenty of tread to last until 20k and be quite safe. During my time at Fisker of OC, we recommended to customers to get their tires done between 18k and 22k, just depending on when the car showed up. We had one customer that had to tow his car in at 28k because he wore through the core on the rear tires.
Yeah, the engineers and whomever else went through tires like crazy at HQ. They also didn't own the car, thus I doubt they treated the car like they owned it.