I fully agree with what you are saying. I also believe its not the Captains responsibility to ask if his flight crew are qualified.
I do believe however that Air France and all other airlines have a responsibility and a duty of care to all passengers and their crews to ensure that all personnel flying for them are fully qualified and trained to operate their respective aircraft in all conditions of the flight envelope.
How Air France get this information concerning qualifications of other crew members to their Flight Captains prior to pre-flight briefings is another matter.