Skurka has backed away from ultralight and long distance hiking in favor of lightweight and shorter trips in the last year or so, as seen in the articles on his website. I think that's because in his career of teaching backpacking courses he's focusing more on beginners than he used to, as well as changes in his own life. Unfortunately he wrote his book before this happened, which is why I recommended the articles on his website rather than his book.

Do note that with the time it takes to write, edit and publish a book, often a couple of years, specific product information is generally out of date by the time it appears in the bookstores. That's one reason I recommended website articles to our OP rather than books. (Besides, the former are free!) It's even worse with guidebooks!