Dunhuang county magistrate deceived the central government, and a captain in Li Si sent someone to report to Emperor Wu of Han Dynasty. Is this correct? Why?

No, Dunhuang County is not under the jurisdiction of a captain. Officials in Dunhuang County who violate the law can be informed by Liangzhou secretariat or physician to Emperor Wu of Han Dynasty.

The chief of Dunhuang is equivalent to the mayor of a general prefecture-level city, the secretariat of Liangzhou is equivalent to the governor, the suggestion is equivalent to CPC Central Commission for Discipline Inspection, and captain Li Si is equivalent to the mayor of Gyeonggi.