After watching “Navalny,” the documentary about the Russian opposition leader Aleksei A. Navalny, a Chinese businesswoman messaged me, “Ren Zhiqiang is China’s Navalny.” She was talking about the retired real estate tycoon who was sentenced to 18 years in prison for criticizing China’s leader, Xi Jinping. After Mr. Navalny’s tragic death this month, a young dissident living in Berlin posted on X, “Teacher Li is closest to the Chinese version of Navalny.” He was referring to the rebel influencer known as Teacher Li, who used social media to share information…