not so Josh...straight up machining a forged wheel generally will not leaving pitting. A forged wheel's metallurgy is much more homogeneous due to pressures used in the forming process versus a cast wheel. Far fewer inclusions are created in a forging. Pitting is a by-product of porosity due to a pressure gradient away from the part surface in the mold which is uncovered after machining and relatively common with cast wheels.

As to your question Deke...simply ask the refinisher if he welds/adds aluminum to the wheel to fill the rash prior to machining back to its original shape...completing with satin finish and clearcoat. Tell him you can tell if the lips will be restored to their original shape (which ensures maximum strength and best appearance) which can only be achieved by welding in replacement metal and turning the lips down to their orignal shape.
HTH,
George