in the sense that his designs are completely his own. Unique. Groundbreaking, maybe.
To me, 'iconic' would refer to long-established classic design that has had huge influence thoughout the watch market/world... (if a movie star, Marilyn Monroe. If a car, Porsche Carrera) so while I personally do not view RM as iconic (because it is too new still), it could be argued that RM still is--in the sense of creating a new design that stands as an icon of the ultra modern... but again, I see your confusion...