Li Yu, the ancestor of Li surname in Jianshan, Caiguan, Anshun

Hello, I want to ask if the ancestor of Li in Jianshan, Caiguan, Anshun is Li Yu? The ancestor of Li surname in Jianshan, Caiguan, Anshun is not Li Yu. The ancestor of Li surname in Jianshan, Caiguan Town, Xixiu District, Anshun City is Li Dingchang, the thirty-second grandson of Tang Gaozu Li Yuan. Li Keming saw this sentence from the genealogy: "Li Dingchang, the ancestor of Li Shan in Jianshan, is a descendant of 32 generations in Tang Gaozu." Therefore, the ancestor of Li surname in Jianshan, Caiguan, Anshun is not Li Yu.