Why is the right brain said to be the ancestral brain?

"The right brain stores 5 million years of information about human genetic factors." The above sentence was found in the "Sperry's theory of division of labor between left and right brains" in Baidu Encyclopedia. You can find it by searching Baidu Encyclopedia.

I don't know if it's true or false.

I am also looking for the basis for this sentence. If the poster is interested, you can check it out. I am also looking forward to a better answer.

As for "the right brain stores 5 million years of human genetic information." I'm not sure whether this statement is true or not, because I can't find the basis for it online (I can't search it).

I'm just a hobbyist.