The benchmark here relies heavily on performance per watt… but Apple has never actually released the power usage of their chip, so the guess of 60 watts is just a guess. Intel, AMD, and nVidia are certainly not fully transparent in everything they do, but at least they release basic performance numbers on their chips and publish architecture documents.
Indeed: a power meter is a must. Intel’s TDP is absolutely not reliable nowadays since their CPUs can roughly use twice as much power; AMD goes over too but not as much. And Apple probably doesn’t do better.
Outside of microcontrollers (where they don’t do it anywhere as much), the manufacturers absolutely bullshit their public TDP numbers. It has been this way for at least a decade.
Only third party analysis of the actual power drawn in a variety of benchmark situations can be somewhat trusted.