The player could be at fault if he fails to bring a valid ID or it is discovered that he violated the ToS. In my case, I would report to the police and forward a complaint to the gaming regulatory body of my country.
Not sure what kind of TOS excuse they can make here since it’s a physical casino. A valid ID should already be the best requirement to prove a gambler is eligible to play, meaning not a minor. The only other possibility is if there’s cheating involved, but if that were the case, why did the dealer still allow the play?
That’s why for me it’s quite questionable, IMO.