It became "false advertising" in a way actually, if you consider Steam and GOG platforms reported Italian language being supported (even if they putted it on by mistake) and so it's deeply unethical..
Except at this time is not even possible to PAY for the game. And the correction of course came BEFORE payment was introduced.
Not that the accusation of false advertising would actually hold any water legally even in a case the change would came later, anyway. At best it would give full right to ask a refund.
Party control in Baldur's Gate 3 is a complete mess that begs to be addressed. SAY NO TO THE TOILET CHAIN
