What Layne has suggested here is that people who believe that cellular swelling (pump) is the most important factor for muscle building are misguided. I also agree with him. This is not the only way to induce hypertrophy. He does not suggest that cellular swelling is not important for muscular hypertrophy. I would highly recommend you read the following text to gain a deeper understanding of the role of cellular swelling in regards to skeletal muscle hypertrophy; 'The Muscle Pump: Potential Mechanisms and Applications for Enhancing Hypertrophic Adaptations' by Brad Schoenfeld and Bret Contreras. It is a very detailed paper and anyone who wants to understand the deeper science behind the physiology of muscle building should find it interesting.