I don't believe that the coat is gorilla fur, I think it's probably fake, and Pete knows it is. Bit naughty to wind people up, but if they're daft enough to believe it, too bad. Certainly not worth getting worked up about, even if it was real fur - it's almost certainly an antique, and you don't destroy an antique ivory item just because we no longer kill elephants for ivory.
I personally have no need of a fur coat, as it never gets cold enough in London, but I don't object to people in very cold countries wearing real fur for warmth. Not from endangered species, though. Why not mink? They're vicious, nasty little creatures that you can't eat, can't make pets of, and they destroy the local wildlife, but they've got lovely coats!