Toad,
You certainly didn't miss the point, the clearance is for the entire aircraft. The areas you worry about were also checked for any hazardous accretions/releases of ice, and no problems were found. Were a problem found, you would see some sort of protection on it, typically starting with some sort of shield, then maybe icephobic paint/coatings, then perhaps heating, each used in steps to attain icing approval. For the S-92, these methods weren't needed (aren't as well for the Black Hawk, which has delivered about 2,000 anti-iced helos, and for the Sea King, which as several hundred.)
You confusion is probably in not knowing the rules under which an operational approval is given. The approval is for the entire aircraft and its operations, not for a rotor system.
If you don't buy it, sorry about that, but the airliners you fly in have the exact same rules and cert methods, to the letter. When visiting Grandma, buy lots of bus tickets, Toad.