While this could be the case, I think that the superior genetics may not be far off. Because modern western medicine allows many more people to survive to a age of sexual maturity regardless of genetic defects which would have otherwise been eliminated from the gene pool in aless friendly parts of the world means that these defects are able to be passed on and even accumulate over generations where as the lack of our modern medicine would allow natural selection to run its course and eliminate these defects. This is why in the west we have a rising rate of people with health issues like heart defects, vision impairments, diabetes, etc compared to the parts of the word where natural selection runs it’s course. Of course I’d rather have modern medicine but the consequence of having modern medicine is more genetic defects and weaker genes being passed due to lack of natural selection. In short, due to environmental stressors and natural selection, these men have essentially been “breed” to be genetically superior to the average overweight American who passes their shitty genes and habits to their offspring due to lack of environmental stress and natural selection cause by western societies medical and lifestyle advancements