I agree... ISAF claim to represent all "International" "Olympic" and "recognised" classes..
Any referance to F16 being an "international class" according to ISAF would deem the sailors in breach of ISAF rules.. Means ISAF membership could be stripped from the individual sailors.. Likewise "national" classes are deemed by the bean counters to be restricted to classes that are officially recognised as such but the ISAF regulated national sailing body..

Im no sure how close the F16 as a class is to official "international" classification but we arent far off.. (the lack of official class status in the national sailing bodies would be a problem for ISAF though)