Close, but not quite. I will circle back around to that in a moment.
But first, I argue that humans are omnivores; while in the womb, we require proteins, amino acids, and digest food, opportunistically from our mother as she consumes food. Once out of the womb, we humans, eat, and require both animal and plant matter in order to sustain health and reproduction. Based solely on this, I contend that humans are omnivores. Because we do not have claws does not rule out this fundamental truth. You are taking evolution out of the equation as is, Im afraid, your doctor you site.
Ok, back to Dr Quack-enstein. He is arguing that humans are herbivores because we have hands and claims we do not produce vitamin C without supporting why. As it turns out, humans at one point, did in fact produce vitamin C, or rather, we were able to synthesize the protein. As mentioned earlier, evolution. Humans have evolved, whereby a particular gene, gulonolactone oxidase, is no longer present in our digestive system. I could go on, but I don't wanna.