I guess the "forbidden knowledge" about her is now so widespread that a fanart like this doesn't feel so "forbidden" anymore.
A cursory Google search would have "spoiled" that a while ago. Not to mention, her rather distinctive voice makes it impossible not to put two and two together.
Hey, I didn't knew anything about Coco from before her debut, and the first time I saw a Kson clip I was like "Chotto-a-minute that's Coco!". Sad to see our dragon go, glad our boss is still around.