He won’t get hired if he isn’t able to speak the language (whatever that might be for the region/clinic/hospital), it doesn’t need to be part of licensing.

Absolute nonsense - an English speaking doctor would be very successful in many Quebec communities, likewise a French speaking doctor would have a lot of success in many communities outside of Quebec. There’s also just as many non-English/French communities where this would be a “problem”. Regulating what language a doctor “must” speak would be just another wasteful bureaucratic hoop.