It is correct, it is not listed.
The interesting question is why not?
I wonder if this is the schema for Azure AD Graph: https://video2.skills-academy.com/en-us/previous-versions/azure/ad/graph/api/entity-and-complex-type-reference#user-entity
where employeeType is not exist.
Does this feature rely on a depricated API?
It is a nice feature, but when it falls short and you have to code it yourself anyway....