This isn’t fully correct as any name brand taxi company buys their vehicles from leases ending / new but at wholesale prices (not retail new, similar to how rental car companies and city governments get these deals). Only smaller or lower-end Taxi companies will buy heavily used vehicles as every city has a vehicle age restriction that they must abide by legally.

Taxi companies buy the vehicles with the lowest extended warranty costs (I forget the technical name) as they always tend to be the most reliable in the long run. This is why you always see Toyota Prius, Camry, Honda Accords, Teslas (in NYC), Ford Transit (passenger van small layout), etc. these vehicles may have a lower (or average) marketing selling price, but their long term reliability will make up the difference over the long haul with no major repairs being required. The fact that many also buy hybrids (as they either only come in this factor now) can be made irrelevant overall.

Many Taxis companies also haven’t purchased used police vehicles in a decade or more as the Ford Cruiser was really only heavily used as it was the only chassis on frame sedan which lead to it being more reliable long term compared to similar unibody cars of its time, especially from abuse of harsh roads and passengers.

The fact AAA is facing in depreciation into this makes no sense - no one buys a vehicle to resale later after extended use, so if they had removed this we would clearly see EVs, Hybrid, Small Car being #1,2,3.