Two people with the same BMI can be either a big blob of fat with a tiny amount of muscle, or a muscular athlete with no fat at all.
The photo of the skin fold callipers is the dead giveaway.
Talking about 'dead giveaways', one town council, and I cannot recall which one, suggested installing heat exchangers in the crematorium so they could recover the energy stored in all the fat f**kers they burned.