What the hell is Shu Yao talking about?

At the end of the Eastern Han Dynasty, during the Yellow turban insurrectionary, the legendary uprising leader of Julu County, Zhang Jiao, went into the mountains to collect herbs. When he met the "Old Immortal of South China", he gave him "The Witchcraft of Peace", and he began to "scatter water" to recite spells to cure diseases. He also called himself "Taoist Taiping" and "Teacher Dade", and created Taiping Dao, also known as "Huang", and his followers developed dozens. Taking advantage of the prevailing social atmosphere of divination superstition in the Eastern Han Dynasty, he put forward that "when heaven dies, the yellow sky should stand, and the world will flourish at the age of 60", and Zhang Xiu, a Taoist priest in Yizhou, also led the uprising.