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.
That is not really much of a problem. There is no question that the fossil record is extremely incomplete. It would only make sense that we would not find fossils of rare species. Nothing in the drawing shows how large the animal was, and we know that some reptiles survived the dinosaur era.