I’m pretty sure it was joke.
Anyway, you guys seem to be backing up my idea that there will be so many fake leaks that it hardly matters even when there are real ones because you won’t be able to tell. Of course, set pictures are the exception. I also have yet to see fake concept art leaks (that I know of), although I don’t see why they couldn’t be faked. Regardless, concept art is often wildly different from the finished product.