I don’t think an attack on the OP is justified he seems to be just presenting an interesting article and was curious.
However people like me are pretty sick of explaining how utterly wrong and crap these articles are, and are sick of doing it for the past several decades, as every few years another dumb twit “scientist” from idiot university writes up a new idea based on utter ignorance of what should be common knowledge, especially to anyone who has studied.
There are people today who mainly eat meat - eskimos.
Apart from the tonnes of evidence that our ancestors did NOT eat mostly meat, everyone is forgetting the absolute most important fact:
Our ancestors who could not thrive on the diet at the time, DIED.
So whatever stupid theory you come up with about what diet we used to eat, you can’t assume it is the best because people used to thrive on it - they didn’t. They died if they were weak. They died if the diet wasn’t good for them.
If you impose the same diet on society today probably 40% of people will just get sick and die.
This has happened in the past.
Around 2000 years ago many celtic germanic tribes forced an all meat diet on their entire population - it was unmanly to farm. Everyone ate meat. No doubt a lot of people didn’t cope well and died out.
What was left were some really strong ferocious people that the romans could not conquer. What is with us now are a lot of germanic descendants who generally do better eating meat. This is a recent (a mere few thousand years ago) adaption / evolution through natural selection that is specific to a region.
Similarly, most northerners do well with milk/dairy. Most people from other parts of the world do not - note that most of those parts of the world, dairy can’t easily be used because the stuff goes off in the hot weather, so it never got popular. But up north it was popular, and if you couldn’t stomach it, you prob. died out ages ago.
The rule is: you alone can determine what diet works best for you. You need to experiment and try new things and find what your body likes. Everyone is different. Don’t look for a magic diet that works for everyone.
Don’t push your personal magic diet on anyone, because most likely it won’t work for them. And if you have kids, listen to what they like and teach them to determine what makes them feel stronger and healthier, and give them variety to determine what works for them.