They do specifically list out the fraction of the market each price bracket constitutes though. This feels more specifically targeted at the kinds of PF advice that would say to look for a "decent condition low miles" beater for $5k. This shows that segment of the market literally does not exist anymore. The equivalent cars are now $15k+ which has VASTLY outstripped inflation from when I first started seeing that rhetoric (2010 or so).
This is not true, the used market was still great pre-covid. COVID obliterated new vehicle pricing and availability, and naturally the used market followed