Ping
It is hard to believe that anyone let a lone a scientist would believe that any human would be that specialized in their diet.
Humans naturally are omnivores. They crave a varied diet.
As far as protein goes for a hunter gatherer society, yes you would take advantage of dependable salmon runs for your protein.
But you are also going to gather nuts, grains and fruits. You are also going to dig for tubers and other root vegetables.
There is not going to be any available food in your area that you are not going to utilize.