That video didn't debunk anything. It's just 22 minutes of straw man. It's never been about eating exactly what hunter-gatherers ate, and it has never followed any assumption that the hunter-gatherer diet is best possible diet.

It is based on evidence that hunter-gatherers showed excellent health, and those transitioning to a neolithic diet showed a health decline. Following that, it takes the sensible action and imitates the fundamentals of the diet, backed up by more cutting-edge studies starting to go against the "high-grain, low fat" spiel. It never claims to be "the best possible diet", nor the actual diet that hunter-gatherers ate. It doesn't need to be either to be a smart decision for your health.

Of course, I get the feeling that this is not really about whether or not the diet is valuable. People tend to take sides on the matter, and videos like these only worsen the problem. Most diets around are healthier than what you normally eat.