Seems like the thing an Einstein level genius could have seen coming beforehand, and wouldn't have said it in the first place. And as an owner since 2016, I can tell you it was never true- I've had plenty of S/X loaners and they have never, ever, been a P100DL. Best I ever got was a beat up P85 in 2019. So they have no data on how often a P100DL would be abused.
As someone that races a Model 3, I've never seen anyone bring a Model S or X to a race track (Plenty of Model 3's though). If it was drag races, who cares, that's what the cars are great at and it's no different than a stop light.
Since we're allowed to make up reasons, it's just as likely that they didn't do it because it was something Elon made up on the spot to sound cool, but would never ever happen as it's way too expensive to maintain a fleet of D100L's on the books, particularly with Tesla's low initial quality scores.
Really makes you wonder why they lock them all on chill now, even a base Model 3. Everyone that gets one comes in came from a Tesla...
Did you know they won't let you test drive a Model 3 P not on chill either? You literally can't see how it drives before buying one. It's a shame as that acceleration would probably sell a lot of very high margin upgrades during the order process.