Why didn't Yuzhou admit that he was from Xuchang?

The reason for this is that Yuzhou is not Xuchang, but a county-level city in Henan Province, which is managed by Xuchang.

Yuzhou, located in the middle of Henan Province, is named after Dayu's meritorious service in water control. The city has jurisdiction over 26 townships (streets) and 678 administrative villages (communities), with a total area of 1.469 square kilometers and a total population of 1.3 million. Yuzhou has a long history and rich culture. Yuzhou enjoys an excellent geographical position and convenient transportation. Yuzhou is rich in resources and energy.