Can the villa on the second floor make the toilet directly above the kitchen?

Article 5.4.5 in GB 50096-201KLOC-0/Code for Residential Design, when the bathroom is arranged on the upper floor of the bedroom, living room (hall), kitchen and dining room of this suite, it should be waterproof and easy to maintain.

In other words, if the two floors of the villa are one household, it is ok. When there are two households on the second floor, the bathroom should not be directly arranged on the upper floor of the bedroom, living room (hall), kitchen and dining room of the lower-level households according to 5.4.4.