he explains that improved nutrition and the use of chairs in Japan is making Japanese people healthier, which makes them look whiter, because healthy people look white. This claim is also apparently unsourced; that is because it is insane.

That almost sounds like he was taking a page from Den Fujita's "if the Japanese just eat hamburgers for a thousand years instead of fish and rice, we'll become white-skinned blonds too!" brand of WTF-ery.