This method helps you to absorb the material because you are learning it the way the brain actually works so it is more efficient. Survey gives you a good idea of which t the author will write about, and mostly people omit this step - and the next one - question. This helps you to learn actively and engage with the material.
Obviously people will Read, but they don't recite or review. Considering that over 80% of the material learned is lost in the first and 90% in the first day, most people will have to relearn the material. So this method is much more effective.