I just found a way to 100% silence the rotor. But DO NOT try to unscrew the rotor! It's screw is only glued on decoration, I scratched mine while trying to unscrew.
The rotor is press fitted into its bearing, you can gently lift it with a screwdriver.
Then I took a .45mm syringe needle and generously applied 3 tiny droplets of Molykote DX Lithium Paste onto the ball bearing slit, then pushed it between the bearing balls with the needle tip. I put a small strip of Kapton tape on the underside of the rotor to cancel its resonance which worked surprisingly well (I thought of this trick from my drumming times, when we used tape to shorten cymbal decay).
Pressed the rotor on again with a plastic rod, spun a few times, wiped off residue paste and reassembled.
Recommend this fix 10/10, beginner friendly, just make sure you got the proper case opening tool, mine fit like 60% exact and was a pain.