Nope. Its a find something to support your point and bend it a little bit.
I was thinking on the point he made though that maybe textbooks in America are thicker because America has more scientific knowledge than Asia and maybe the books get updated more often and maybe they are more in depth. Basically, I do not think you can just take one variable and compare it to another and proclaim that's the reason.
I have a masters degree from both a US university and one in Europe. It always struck me how the American books were consistently thicker then the the ones I got in Europe. The contents was the same basically, just much more condensed writing. The American books I could read almost like a novel, whereas before I had to carefully study each page, sometimes read it two times to understand what it meant.
Just a matter of style really, I wouldn't read too much into it. Perhaps the fact that in the US you have to pay for your own text books is a driver too.
I was thinking on the point he made though that maybe textbooks in America are thicker because America has more scientific knowledge than Asia and maybe the books get updated more often and maybe they are more in depth. Basically, I do not think you can just take one variable and compare it to another and proclaim that's the reason.