Why didn't Kunming Power Supply Bureau recruit previous graduates?

Whether it is Kunming Power Supply Bureau or other state-owned enterprises and institutions, such as banks, credit cooperatives, securities companies, etc. Only recruit fresh graduates, which is a hard target given by the state to every state-owned enterprise and institution in order to alleviate the employment pressure of fresh graduates. Of course, in addition to civil servants, some civil service examinations do not require fresh graduates.