I've long suspected that to be the case. The story being broadcast is that everyone was chasing NZ after they started foiling. However, from the very beginning I think the rule was written to make foiling very difficult but not impossible. I'm pretty sure Oracle had already planned to foil. If they REALLY wanted to disallow foiling, the rules would have been written that way. You could say something simple, like "no underwater foils should have horizontal components" and that would be the end of it. The thing that does surprise me is that Artemis was later to the foiling game than anyone else even though they were the challenger of record. They must have been caught by surprise on the foiling thing.