I agree. The main claim to fame of Chu’s book is that it was one of the first to popularize plyometric training in North America. However, in Supertraining and Facts and Fallacies, Siff mercilessly trashed Chu’s interpretation of the Soviet literature on the subject. If you can find a cheap copy of Chu’s book and a copy of Siff’s it might be worth comparing them to each other if only to stimulate your critical thinking on the subject.