Actually, IIRC (and correct me if I'm wrong) for accounting purposes, gold counts as "cash & cash equivalents", so if it bought $1B in gold bars, AirBnB's cash wouldn't change.
Gold is highly liquid, and from what I've read, it can be considered (in bullion) cash equivalents, except for banks, that due to Base 3 regulations can only consider part of their gold holdings as cash equivalent for liquidity purposes.