The first paragraph has an error: “Over two millennia old, the token is one of three of the same design known to have been cast in gold,” then it corrects itself by correctly stating that it’s a minted (Struck) coin As far as I know the Romans never casted any gold coins, did they?
This is likely just a colloquial phrase: I doubt anyone outside of coin collectors would understand/care about the difference between striking and casting a coin.