They need to know that there is a very real danger of lodging a real gallstone, in the bile duct, by causing the gallbladder to contract continually, during this protocol.
Yes, you are totally correct Spud. The strong contractions of the gallbladder by the oil could lodge a real stone, if present, in the bile ducts. This can lead to pancreatitis, so a lodged stone needs to be removed surgically immediately.