A geomantic omen once predicted the demise of Qin. Is it a conspiracy or not?

At the end of the warring States period, the Qin dynasty unified the world. However, Chu Nangong, the teacher of Yin and Yang, predicted that "although Chu has three households, Qin will die".

Because at the time of the war in Qin Chu, Chu Huaiwang volunteered to be a hostage in the State of Qin in order to avoid the suffering of Chu, and the Chu people admired him deeply. But Chu Huaiwang eventually died in a foreign land, and even the bones were not allowed to be transported back for burial. Therefore, the Chu people hate the Qin people very much. So if Qin really ruled the country, but as long as one person rebelled against Qin, many Chu people would join the rebellion.