You can have a light swoitch in a WC, you can have a light switch in a bathroom. It can be inside or outside the room.
All it has to be is suitable for the environment.
The old paradigm was to use a pull switch in a bathroom because you may have wet hands. But that doesnt work. I have wet hands in my kitchen, but theres a light switch on the wall...
As there is not a bath/shower in the location the regulation are different as you are not dictated by zones. But an amount of logic, with regards to moisture ingress and functionality should be taken when deciding where to locate the switch, but it can be inside the room.
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