Interesting but looks suspiciously new.
The explaination that the back is leaves is ridiculous but the other thought that a film company may have created it makes me wonder.
http://blogs.smithsonianmag.com/dinosaur/2009/03/stegosaurus-rhinoceros-hoax/
The lack of weathering, referenced at your link, really strikes me. Having been to Ankor Wat and Ankor Thom, it just isn’t consistent with what I saw. Also, there is the minor problem of stegosaurs being extinct for 140 million years.