You only get mileage credit for codeshares on skyteam metal. Read the remark on the top of the airline partner mileage earning charts on DL.com. There are some reports on FT from people who got miles for AF coded flights on non skyteam metal, but I would not bet on this and my experience is that you won't get it. However, I never took an AF coded Luxair operated flight. My experience is based on AF coded flights operated by OS where I (in my opinion rightly) did not got credit.