I'll disagree. I think you are implying that the light provided by the sail directly mimics a navigation
light. Would you consider an entire flopping (or taught) panel of red or green sailcloth (or maybe a nice yellow), glowing gently, to be a confusion as to the markings of a vessel? I'm thinking of preventing close-in collisions, not a means of acquiring the vessel at a distance. But again, I am wondering if this has some relevancy and trying to imagine an application beyond what prescribed navigation
lights would signal.