among the reasons it's bullshit:

The herbivore in the picture has it's canines removed, like most horses so they can take a bit.

Take a male and female human, set them innawoods and get them to bring a child to term. See if it's even possible without them relying heavily or even exclusively on animal meat.

It's only through technology and cooking and abusing the shit out of our environment that we can pretend we don't REQUIRE meat in our diet.

We do not require fiber in our diet.

We are obligate carnivores doing everything we can to deny our true nature for the past 10,000 years. We also like to eat fruit, but there is nothing we can get from fruit and plants that we cannot get from a whole animal.