The first thing we need to find out is the state the aircraft was registered in, perhaps some one with much better French than I have can clear this up.
Not all states have the utterly stupid regulations that the UK has with regard to who the Captain can let into the cockpit.
I find it most refreshing that some states trust to the judgment of the Captain of the aircraft in these matters rather than to a bunch of faceless idiots who make rules with no idea of end result.
All that having been said on the face of this it seems rather harsh to fire someone for reporting this happening to the managment, I am sure that we are only getting half the story.