Can you define what you see as the class rule violation? If the code zero has additional hardware associated with it - like a furler - then I agree with you.
But if all they are doing is running a flatter asym chute that is smaller than 89m2 then that would appear to be legal by the class rules as long as it measures by the rule, has luff, leech, and foot cords, and they don't exceed the max number of chutes allowed on board for the race (two). RH has a new 77m2 listed in sail inventory on j105.org, so I am assuming this is the "code zero" they are referring to?
I suppose it comes down to the interpretation of the term "code zero".