Yes the rotor plate is fastened to the hub with the studs. If it was done correctly, the studs should go throught the rotor plate, then through the hub and staked on the outside of the hub so they can't slip back out. When you replace the rotor plate, you need to remove the staked area and then press out the stud to release the rotor plate from the hub. In the past, when you could get the studs easily, you just replaced them. Nowadays, most people try to reuse/restake them if they can.
