It applies only to dinosaur bones, honestly. I think the dinosaur skeletons displayed in museums are all from castings, and not the actual bones that were dug out of the ground. It definitely does not apply to art pieces, unless it's a small/poor museum which can only get prints or studio replicas, it's clearly labeled as a replica.

Or, some statues exist only as castings, and are all technically 'replicas' and the original was destroyed as part of the casting process.