The promotion it seemed, is much tastier than the food or whatever being promoted here. Clearly it is becoming a trend for all new startups in China to turn to nudity and sex to win publicity and hence customers, as long as they did not break the law.
They did not break any rules here, these "chefs" were all dressed up according to the rules. Just that the rules did not say the dresses worn cannot be transparent. So there is a big loophole there, which the Chinese authority are not in a hurry to patch up. So let's enjoy the pics.