Or it implies that people with debilitating conditions don't survive for very long because the Bushman lifestyle is much worse for them in a wide variety of ways, so don't get factored into assessments of the surviving population's general health.
More generally, the fact that a specific group of people who live outdoors and forage and hunt for food are generally in quite good physical shape is probably a better indicator that exercise is good for the physique (and lots of food and a sedentary lifestyle bad for it), than an indication we should go to the supermarket and buy more red meat in proportion to the amount they consume it. Older people can be wiry and surprisingly agile in vegetarian communities where there's [just] enough food and their traditional lifestyle entails walking around everywhere too, but that doesn't mean vegetarianism is a solution to first world dietary problems either. I'd be cautious about conflating agile with free from discomforting ailments too.
More generally, the fact that a specific group of people who live outdoors and forage and hunt for food are generally in quite good physical shape is probably a better indicator that exercise is good for the physique (and lots of food and a sedentary lifestyle bad for it), than an indication we should go to the supermarket and buy more red meat in proportion to the amount they consume it. Older people can be wiry and surprisingly agile in vegetarian communities where there's [just] enough food and their traditional lifestyle entails walking around everywhere too, but that doesn't mean vegetarianism is a solution to first world dietary problems either. I'd be cautious about conflating agile with free from discomforting ailments too.