Is Guiyi Tong Zenith in Cenxi City located in the south of Cenxi?

No.

According to Baidu Map query, Cenxi City Guiyi Tong Zenith is located in Leshui Village, Guiyi Town, Cenxi City, in the southeast of Cenxi City, not in the south of Cenxi.

Cenxi City was called Yizhou in ancient times. The Guangxi Zhuang Autonomous Region has county-level cities under its jurisdiction and is managed by Wuzhou City.