That sounds sketchy...does Tesla often sell cars at wholesale auctions? They have cars all the way from 2012-2019 on their Used Inventory. I wonder if they do that for salvage cars or any where they will no longer offer a factory warranty due to an accident or other issue.
and you are correct, the price people are paying for used Tesla's are crazy, yet owners who bought a few years ago(and got large tax credits) keep whining about how their car has lost so much value.