I saw the technical article from pelican parts. Enclosed is the attachment showing the rotor is held to the hub by two roll pins (yellow arrows) and a 4mm Allen screw (red arrow). This is a little over kill as the wheel studs actually hold the rotor to the hub once the wheel is installed and torqued.
Use a punch and hammer the roll pins out the back of the rotor and hub (red arrow).
The roll pins are hardened steel; use a hammer and punch to reinsert them when you have installed the new rotor.
I hope this is more clearer in describing the issue.