What is right and/or wrong in this advice?

https://www.businessinsider.com/how-to-buy-a-used-rental-car-step-by-step-guide-2020-6

If you are considering cash buying a rental fleet HD pickup truck,
what additional considerations should be thought over?

Is there a financial calculation one can make to renting an almost new pickup for so many $ for a month
versus paying a fixed $ to outright buy a ex-rental pickup that is Maybe 3 years older?

Wall Street Journal had an article about how Hertz set up 2nd party leasing companies,
then these “independent” vehicle leasing companies lease the vehicles to Hertz.
The 2nd part leasing companies purchase the vehicles with funds raised by issuing special bonds that were generally bought by banks or pension funds.

The banks and pension funds are asking the Bankruptcy Judge to sell off the vehicle fleets quickly because $ depreciation of each vehicle per day is high.