This process could take years. If I was an accused and was banned from earning an income I would have my lawyer seeking injunctive relief ASAP. The argument being innocent until proven guilty, prevented from earning an income therefore impairing the defendant's ability to defend themselves, if proven innocent the defendants will have suffered a penalty unfairly.
HRNZ and the RIU had better be careful with the bannings because effectively they have penalised the defendants WITHOUT ANY form of hearing.
I would have thought that the proper process would have been to charge them under the racing rules first and then go through that process.