The rule is:
F.5. RANKING On events sailed under F18 rules, there shall not be specific rankings according to the different competing brands or types.
I must be reading this entirely differently, because I don't see how it precludes listing the brand name in either the registrations or in the results. It just sounds like they don't want you posting the results for the different brands separately, for any given event or for a series of events. And that makes perfect sense.