Unlike "conventional" code zero's, AC 75 Class code zero's bear no relation to spinnakers. Just check the sail dimensional limits in rule 19.14.You can’t tack a jib on a bowsprit (you should have learned that in 1992 ). Code Zeros belong to the spinnaker family (chord stipulation at half height). Before cursed Coutts messed things up, such a sail would have been called a screacher
The issue in 1992 was the way NZL used the bowsprit when jibing the spinnaker, not how the sail was classified.