Still don't make sense because there must be an actual gold somewhere to match with the ones on the little cold storage otherwise it will remain digital and can not be useful in the real world except online, so in essence, having having those tonnes of gold bars is still very important.
Let's be serious.. at this point, any internet connection disruption would cause HUGE trouble for the entire planet. Almost everything depends nowadays on an internet connection.
Banks want to go digital anyway. I don't think a plan to move their reserves into BTC rather than gold would be a far stretch. In fact, it'd be easier for them to store & move money this way.