I encourage the author to take an economics class. There's a common trend of smart people trying to fumble through what amount to the first semester of economics. Even a brief exposure gives you enough knowledge to know the name of what you are interested in.

In this case, it's an argument for price discrimination -- charging different prices to different buyers based on their willingness to pay. And in fact "textbooks" is one of the examples given on https://en.wikipedia.org/wiki/Price_discrimination#Textbooks

This allows you to lean on what's already known. Specifically, identifying market segments with different elasticity and enforcing the scheme.

Have people started using the phrase "purchasing power parity" to refer to a pricing scheme that corrects for PPP? I think "parity" might be leading people astray because it actually just refers to an adjustment to GDP or other indicators for purchasing power. It doesn't refer to a pricing scheme. I could suggest the name "Purchasing Power Parity Pricing" if you want something you can say you "support".

(That said: I think this is isolated to extremely high margin goods and will not translate to others.)