To be honest, I'm socked. they did not accept gold?
IF someone handed you Chinese or Swiss currency and you hadn't seen it before would you accept it? One is worth considerably more than the other but you wouldn't know it.
Edit:
THIS IS INSANE. Who would risk having someone accept a 100g (over 3oz) gold bar for a to go food order? The video could be fake. They guy could take 4 months off his low pay job. At least try a 1/4oz gold coin, preferably something more recognized. People are going to think a big bar is a fake.
Technically a coin such as a 1/4 oz US gold coin has a legal value of $10, which is how much a bank would be required to give you for it. So the restaurant should accept it if they would normally accept cash, and would be legally required to accept it at its face value for the payment of a debt.