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That's because cooking meat expanded our diet rather than replacing it

We're omnivores not carnivores! It's the variety that helped give us the competitive advantage through history. We've also, over time, lost the ability to produce certain chemicals naturally as we get them from our diet...such as vitamin C. Nearly all other animals can produce it. So Vitamin C would be missing from your diet if you only ate meat and you'd die from scurvy. So yeah you wouldn't be smart to only eat meat now but you wouldn't have been smart to only eat meat millions of years back either.

This is probably oversimplified, but I'm too ignorant to actually dispute it

No, interacting with each other in complex societies made people smarter.

Yes because everything is black and white and off course there was only one influence on human evolution.

You need more interaction, or meat, whatever does the trick