In my own opinion Liangzhu is one of the origins of Chinese culture. Some researchers think that it is the mainstem or main contributor of Chinese culture, because of its jade crafts and worship/funeral practices. But there are also archeological sites of other ancient cities in other areas in China, earlier or later than Liangzhu. I would rather take his hypothesis that before Shang Dynasty, cultures emerged and evolved simultaneously in different regions in the land where now we call it China, and then they merged into current Chinese culture -- either peacefully or by wars and conquers. All these cultures are contributors, but it is hard to say who is THE origin. Well, this is only my own opinion at the moment. Historians and archeologists are still debating over this.