He does, but you have to read between the lines (so to speak). In graphic design, objects feel anchored when they have some strong relationship to the other objects on the page or to the placement on a series of pages. You could plop everything dead center and be done with it, but most designers would say that that's terrifically static and dull. Usually designers like to work with a grid pattern. But here he's also working the corner angles, to get a further relationship to the page elements that helps to anchor the content (in a subtle way) without being static and without looking arbitrary. Ultimately, the only thing that's important is that it's just a very pleasing structure.