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> agriculture being < 500 generations old

Evolution works in as few as two generations. This is established.

> Stone Age humans were apex predators, only moved to more plant-based diet 85,000 years ago

We’ve evolved since then. We are the same species but claim we are genetically the same as humans 85,000 years ago is crazy.

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However your physiology doesn't change in two generations. We can easily adapt our microbiome to get access to new sources of calories. But our erect posture, tool crafting and use abilities, and our guts structure are all evolutions we gained from our hunting/scavenging times. We are what we are because of meat and fat, not green leafy vegetables.

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