Not a polymer but an amorphous solid like many polymers; I believe she popped that nugget while explaining crystallinity and glass transitions. She was quite knowledgeable otherwise but that little false factoid must have slipped through.

It’s also not the reason church windows are thicker at the bottom, a common myth that my ex-colleague with a PhD in polymer chemistry(!) somehow bought into

Can we leave Mr. T out of this, the man who goes by that name still has my respect :)

But whattabout Vietnam?

I think that’s actually a different interview and that this is the one referred in the OP: https://youtu.be/Iyasgj3e-wE