There is nothing in the French report saying that.
. At take off, Captain is PNF from his LHS; FOx is PF from RHS.
. At 0159, Captain go to rest and FOy takes his place (LHS) as PNF.
. AP2 is engaged, meaning that the aircraft is flown from RHS.
=> If the PF was FO2 at take off, FO1 would have taken his RHS (but he didn't).
It means that the PF at take-off was FO1 from his RHS (David Robert).
The ambiguity (and press belief) is due to this sentence "le commandant de bord réveille le second copilote"
But it takes to be a French native speaker to understand correctly that it doesn't mean "2nd Officer" but the other co-pilote (as they are two on board, it could be either copilot).
rgr on this. Missleading in the german and english translation and i misread this in my french knowledge.