Cool. Ok, so that really is what this comedian calls himself (herself?). But why was I marked wrong for "một NGƯỜI diễn viên hài"? Does the classifier not need to be there in this context? Does comedian just happen to be a countable noun?
Is this a saying in Vietnamese, or just a strange sentence?
No, it isn't. There is a famous comedian in Vietnam. His name is "Công Lý". You can search "Diễn viên hài Công Lý" on Google to find him.
He's a famous comedian.
Here in Israel they say that sometimes tzédek (צֶדֶק, meaning both ‘justice’ and ‘Jupiter’) is just a planet.
Ở Việt Nam Công Lý chỉ là Bắc Đẩu