I know what your beef is, Chubby. Take a closer look at the review, and you'll see that I address it in the fifth or sixth paragraph.
The problem, with book publishing, is that the designers and art directors often have more say in what a book looks like than do the editors. As a graphic element (hold the book at arms length and squint your eyes) that font change might (I say might) make sense. The fact that it detracts from legibility isn't the graphic designers concern.
Now if there was a physical reason for it, I'd say, OK, do it. But the fact is, if they'd kept the font size uniform, it would not have increased the size of the book, because there's so much extra room on each page.
It would be interesting, though, to find out how many people found the book less useful (or maybe didn't even buy it) because of that problem.
They have taken the oath of the brother in blood, in leavened bread and salt. Rudyard Kipling