They didn’t even try. The hunter-gatherer bones were identified as such by the contest they were found in
“Hunters and gatherers get vitamin D through their food - because animals have a lot of it. But once you’re farming, you don’t get a lot of it, and once you switch to agriculture, there’s strong natural selection to lighten your skin so that when it’s hit by sunlight you can synthesise (sic) vitamin D.”
My grandfather was a farmer. He had a smokehouse full of bacon and sausage. He raised chickens, hogs and cattle. He had two ponds stocked with fish and a creek running through the property. Farmer does not equal vegetarian. I miss science.