I'm honestly surprised, an amazing single chapter character arc. I was not really feeling this guy for pretending to be dissatisfied with the Four Winged Lion's food just to make himself look more sophisticated. If food is good just say that it's good. This may be a deep cut but in Yakitate! Japan, Kirisaki told Kuroyanagi that a true Food Judge/Critic will never say that a good food is bad. I take that philosophy with me through all of these food manga to see who's a true gourmet and who's a pretender trying to and make themselves look better.
LOL, you say all that, but if Kirisaki's criteria is just to not lie, then the guy didn't do that. When asked directly if there's anything wrong with the food, he said no. All he did was make a grumpy face while eating, which yeah, might have made Ludwig nervous about it, but in the end he never outright falsely said the food was bad.
Sure, we know he was putting on airs here, but honestly, if I were the cook and got a guest like this, I'd just chalk it up as the guest being tired or just being in a bad mood.