RLS for external Users

Hi everyone, 

I want to share dashboard with RLS with external users (of course, with another domain). According to the documentation, it is not possible: 

• External sharing is not currently supported with datasets that use RLS.

https://docs.microsoft.com/en-us/power-bi/service-admin-rls

If I add an external user to our company's active directory, will he still be handled like an external user and thus not be able to see my dashboard? Or will he be able to see the dashboard, because he was added to our active directory and thus not really an external user anymore?

It would be very nice if someone could help me on this topic. 

Thanks in advance.

Best regards

Magomed.