Hello, poster
Of course it is useful, but what I have to say is that the reading method he advocates is reading for the sake of reading, which he himself admits. . Reading for the sake of reading is a more extreme method of studying that involves working hard to produce results. This is far from one's own interests. I believe that not many people can accept it and follow it. However, if you can really treat yourself as harshly as a missionary, you will have a much greater chance of success in anything, not just studying.