Dinosaurs lived 800 years ago?

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Quote.
"After wandering through the temple and marveling at the twisting fig trees for over an hour, I finally located the glyph I was searching for near the exit to the complex. Before me, enclosed in a round circle, was a clear depiction of what could only be a stegosaurus.

The creature had a small neck and four short legs with a long tail. Along its humped back, a series of plates were clearly carved. As I stared in a wonder, a guide leading two American tourists approached
the spot and casually asked them if they believed dinosaurs lived 800 years ago? He then proudly showed them the stegosaurus carving to their utter amazement."

Did stegosauruses live as late as 800 years ago?

Where does the evidence point?

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