Teaching English is humanities though, not IS, so that doesn't work. (To clarify, teaching at any sort of private company. A K12 school has a dedicated Instructor class that can't be used for anything else.) And translating (which requires proficiency) is IS in some cases I think?

I also initially read it as "this is an example of the type of category that would have the requirement". Which doesn't preclude other categories also needing the requirement.