Author here. I did consider doing that. But ended up using elephants for height and mass. I didn't think the volume or area of an elephant was a very useful comparison!
It looks like they defined that stat internally as "1.046e7", which would be a reasonable number assuming Joules. Elsewhere it defines Kilocalories as "0.000239006"... but I'm guessing they meant it the other way around (i.e. "4184" not "1/4184") based on how they use the data in the functions.
Sure enough, if you do 4e10/4184^2 you get right on target. I think other things in the energy category may have the same "wrong conversion direction" bug as well.
1 Electron volts = 29.8 x the energy released Tsar bomba 69.5 x the energy released by convert 1 Kg of mass to energy. Something is way off, and it's not just the singular/plural of "volt"
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