The data in the article is kind of all over the place. But also at least one big distortion is that

* these are rental cars, which are used much more intensely than normal used cars

* a big chunk of the (US) stats are Hertz dumping Teslas, specifically. It had to dump 30,000 of them (which is a huge amount of Teslas to just flood the market with all at once); and Tesla specifically has people trying to sell their cars due to the brand of their CEO.