There are some errors in your calculation.
1) Assuming people in concentration camps were emaciated and starving, as in photos of WW2, they probably were not 80.7 kg (178 pounds) but more like 70 lbs (source: https://www.timesofisrael.com/i-weighed-70-pounds-last-auschwitz-survivors-remember-a-living-hell/), which is 32 kg.
So that's a little less than half of your original calculation.