EDITED
Cross posting
I have been unable to find reference to the captain questioning the PF's credentials (was this before the upset? before the flight?). If the captain had enough concerns to actually make a comment then how does he allow this individual to actually be the PF when he retires from the cockpit????
English report N°3 page 73
A little after 1 h 52, the turbulence stopped. The copilot drew the Captain’s attention to the
value of REC MAX, which then reached FL 375. The Captain made no comment and, a few
moments later, he woke the second copilot, said he was taking his place, and asked the
copilot in the right seat if he had a commercial pilot license. He thus ensured that he was
qualified to act as relief and implicitly designated him as relief pilot. This question to the
copilot probably meant that the issue of the relief pilot for the Captain had not been raised
during the briefing before the flight.