Except that the energy need of a human is not 2500 ps3-hours/day, it's 2500 kcal per day. The article does actually use absolute numbers in quite a few places,

Except that the energy need of a human is not 2500 ps3-hours/day, it's 2500 kcal per day. The article does actually use absolute numbers in quite a few places, and there the units do matter.