Note that the author means "fonts/sizes that are 16 pixels tall" NOT "16 point fonts" (which is what you get when you pick 16 in MS Word or whatever). The diff

Note that the author means "fonts/sizes that are 16 pixels tall" NOT "16 point fonts" (which is what you get when you pick 16 in MS Word or whatever). The difference in terminology is subtle to look at, but huge in practice.