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My Chinese History professor once had a meeting with many other prominent scholars in this field to discuss the credibility of the book. They found many dubious details in the book such as that the authors frequently (perhaps purposely) incorrectly cite other sources in order to strengthen their arguments as well as use unsupported information. In the end, they concluded that the book is factually and intellectually unreliable. Driven by curiosity, I borrowed a copy from a friend and read couple dozen pages, and concluded that the book is more like an anti-communist propaganda and I should jus trust my professor/her colleagues' words.