Why isn't Dialkia a Paradox?

>people saw Dialga/Palkia in the past, but couldn't really tell which one it was
>so they built a statue based on features of both, creating a representation of a pokémon that doesn't actually exist
How is this any different from Iron Valiant being a mix of Gallade and Gardevoir and being brought into existence because people somehow thought it existed inside the Paldean Crater?