Does using a high Cm reverse horizontal tail airfoil coupled with a low Cm wing increase horizontal tail effectiveness?

Just noticed that the Zenith 701 wing uses a NACA650-18 which is low cm, while their inverted horizontal stabilator uses a NACA4412 foil which is a high cm foil. They could just as easily used a low cm NACA0018 or NACA2415 foil with a slatted elevator to get the same cL, but they chose a high cm foil instead

I'm assuming using a low cm wing and a high cm horizontal tail adds to the effective moment produced by the area of the horizontal tail, allowing for a smaller horizontal tail area.

Is this correct?