1) There are no stegosaurs known from that area of Asia. That doesn’t make it impossible, simply less likely.

2) Even the article being cited points out that this is a jungle temple. Jungles tend to not have any fossils. They are very wet (which is erosive). They have high levels of bioturbation from scavengers and ridiculous plant root structures that are regularly disrupting soil sedimentation.

3) Even if they did find a fossil it would not likely have been recognizable as a stegosaurus.http://upload.wikimedia.org/wikipedia/commons/0/04/Stenops.jpg This is an image of a stenops (same group as stegosaurus) as it was found after it had been carefully excavated by expert paleontologists. As you can see, it’s very disarticulated and even modern scientists argue of the particulars of its reassembly.

Occam’s Razor relies on the introduction of the fewest new variables which in this case would seem to mean it was a rhino or pulled from human imagination/mythology.

The head is much too large in proportion to the rest of the body to be consistent with any members of the family Stegosauridae. The fact that this photo was taken at an angle is somewhat perplexing as it seems to needlessly obscure details of the head region.

One of the most interesting things about this group of dinosaurs was that their hind legs were much longer than their front legs. The robust humerus and shoulder blade probably served as sites for powerful muscle attachment that indicate a semi-sprawling posture in the front. However, their hind legs were very long and pillar-like which along with other features seem to indicate an upright hind-limb stance. This carving appears to show the opposite.

And while I’m amazed I even have to point this out, Stegosaurus, and other members of that group of dinosaurs, had giant spikes on the end of their tails. That was what made them so cool! Even the primitive members have some form of spike going on.

Lastly, the Stegosaur group was already in decline by the Cretaceous, coincident with the rise angiosperms (flowering plants) as well as the rise of new types of herbivorous dinosaurs. This group clearly peaked during the Late Jurassic and maybe didn’t even survive until the K/T boundary where the other then extant dinos bought it. The Late Jurassic was 159-144 million years ago, while the extinction of the dinosaurs was 65 million years ago. That’s 65,000,000 years compared to the 800-1400 years this civilization was round just for some perspective.

Explaining their survival even up to the extinction event itself is difficult so it seems preposterous to conclude that they could have survived through the event with a sustainable breeding population to get through, among many other obstacles, the Ice Age that ensued to then be seen and carved by humans in relatively modern times.

Most likely, it’s a rhino.