I only know that Darren Bundock admitted that he had ordered a two-piece carbon mast for the Viper as a measure to cover that base. Apparently, they decide not to use it on the trial boats (although there was a third Viper at the trials)

Maybe he brought one along, just in case, and mentioned it as an option in that panel discussion. Personally, I feel the two piece mast is a pointless requirement and it appears none of manufactorers are in favour of it even when they covered their bases as Darren did (nacra for example did)