IIRC, the CFX was sold as Peugeot's 80's genuinely racing frameset, with it's high quality full Reynolds 531 double butted tubeset, so it's not surprising to see such components that might have just been conveniently on had installed on it. Saying that, I would have just replaced the levers with something better that matches up with the caliber of the frame as those DiaCompes were pretty much bottom end market items that had been adapted to the race frame. If you want to stay with DiaCompes, you can still buy better ones at very reasonable prices like the non-aero versions of their RGC (Royal Grand Comp) model levers vor very reasonable prices, even at NOS condition. Otherwise, you could also consider European made levers and brakesets (Mafac, Spidel, CLB........), but those will most likely cost quite a bit more than Japanese period components. Swiss/German levers from Weinmann will mostly be cheaper than thaose French brands, but will be at home on that Peugeot frame, as Peugeot had Weinmann brakesets on a lot of the bikes in the 70's and 80's.