The specifics of this diet really boil down to:
1) Eat fresh meat, fruit, nuts, and vegetables
2) Avoid processed and unnatural foods
All the hoopla aside, I don’t see how that isn’t a formula for being healthy.
It’s a marketing gimmick, but I think it’s useful because telling people to eat healthy can be too vague and it has some negative connotations.
But tell them to eat like our ancestors did and it allows people to focus on that.