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It's an interesting idea, but I'm not convinced - there is already an excellent connection to a decent damper (the tire).
My money is on the change simply being the pads being pushed more forcefully against the rotor - that can, and sometimes does in my experience, eliminate the rotor vibration (squeal).
I wonder whether having the chain taught might be coupling the hub to the large mass attached to the pedals, which could act as a damper.