Try reading your own link, "It's important to note that this fallacy should not be used to dismiss the claims of experts, or scientific consensus.". You are trying to do exactly that. Pointing out that you are in conflict with basic economic knowledge is not an appeal to authority. You asked why he was worried about deflation, I showed you why, I wasn't making an argument, I was giving you the information you asked for. Ignore it if you like, I'm not interested in arguing with you.