One criticism of his argument is he takes a bus option and compares it to the most expensive light rail system.

He also doesn't discuss ongoing operating expenses like fuel, life span of vehicles, or personel requirements to operate.

While there certainly is an argument that busses can be cheaper than rail, I think this isn't a complete argument provided. It can be good to start the discussion, but I would be surprised if cities aren't doing some cost benefit analysis of different systems with projections 5, 10, or 20 years down the line.