If you actually understand what Coriolis Affect is, you will also understand that it has no affect in a reference space as small as the diameter of a helicopter rotor system.
RMK is correct. The two are related, as the Coriolis is "caused" by movement N/S being closer(or further away) to the perpendicular of Earths axis of rotation, thus being closer to the 'centre of the roundabout'. But over a rotor disc dimension, the effect of Earth's Curvature is beyond negligible. Blade coning, however, will cause an increase in Nr as the diameter will be (slightly) reduced, and therefore angular velocity will increase in order to conserve angular momentum.
Same reason it's funny to get kids to sit at the edge of roundabout as you start pushing it, then get them to try and touch the middle. Hilarious.