I think a lot of people are confusing the owner (Jo, owner of MocaJo, introduced in Chapter 34), who knows that workers frequently quit but chalks it up to the fact that it's mostly servers who quit and they're students so them only being very temporary makes sense, and one of the senior cooks (shown in Chapter 47.1) who warns Ichinose about Nanao, and how she seems to almost have dirt on the owner to keep him from doing anything to her despite the cook mentioning her being a problem to the owner.