I think that Wikipedia article is about a different idea than the parent video.

The parent video is about the idea that an "individual" human mind can be described as being composed of subordinate minds. In this case, left-side vs. right-side.

The Wikipedia article is about the idea that there's no single metric by which we can judge human intelligence. This is, it's theoretically impossible to have any score, like IQ, that cleanly qualifies how smart people are relative to one another.

Seems overly simplistic to me, I mean, one of us.