A couple other naked restaurants already exist in London and Melbourne, but this is the first one that subjects its patrons to being judged by size like a bulky carry-on item at airport security. Per the website, if you look like you are overweight, you will be weighed to verify, and then sent away.
Here is the website's visiting procedure, cryptically translated by Lord Google.
Here, kilometers is meant to mean kilograms. 15 kg is about 33 lbs, so basically, if you weigh 30 lbs more than the average for your height, no food or paper diapers for you.