What does it mean to recruit "rental personnel" in public institutions?

You don't belong to this organization, but to a labor organization of a third party, which sent you to work in this organization.

All your understanding problems have nothing to do with public institutions, but are the responsibility of third-party institutions.

The salary is also paid by the institution to the tripartite organization, which will send it to you.

To put it bluntly, you don't have the establishment of public institutions