French grades for cracks make no sense, since, in France, they can't grade cracks for toffee.
In my experience:
Fr6a = 5.9
Fr6b = 10a/b
Fr6c = 10c/d
Fr7a = 11a/b
Basically, if you take a letter grade off the French grade it's more realistic.
Your University wall would probably get given closer to F7b/+ if it was in Chamonix. (not saying it *is* F7b+ though)
Either way, I love the fact he does just do these things purely for the fun of it - no fanfare, just climbing. Nice.