For people who have already trained to an elite level with regular weights.
I don't know how Neanderthals got strong but I'm not sure they had a lot of rocks to carry regularly.
and the "results" are a bit artificial as well, what matters is a strong core, legs, arms, but not the useless volume you get when lifting, because that's not a movement we do in our daily lives, we rather do small movements, static pauses, small weights. Better training for the right purposes