The French work proves that the shroud could have been produced by forgers using techniques available during the middle ages when the shroud first appeared.
All it proves is that a piece of cloth could have been dusted with Ferrous Oxide to mimic the superficial appearance of the Shroud. it does NOT prove that the Shroud's features that have been scientific determined to not have been created with a dust of Ferrous Oxide or any other man-made pigment was created by "techniques available during the middle ages."
This technique was used 20 years ago by Joe Nickell. The "French Team" did nothing to add to what Joe Nickell did. Nothing. Joe Nickell based his attempt on a scientific paper done in the 1960s about using a dusting of carbon dust with an egg albumin fixer on a bas relief to eliminate the directionality seen in the attempts done by others who had done Bas relief rubbings back in the 1930s and who also claimed to have proved how it was forged. At least Joe added something new... attempting to duplicate the straw yellow/brown color of the image. Other than that all of these bas relief attempts have failed because the substances they use to rub, dust, dab, fix, etc., stand out like a sore thumb on their efforts, easily seen under a low magnification microscope, while the image creating substance on the real Shroud can only really be seen with an electron microscope.
I can make a picture of the Mona Lisa using chalk. That doesn't mean the Mona Lisa was painted using chalk. I can make a replica of the Statue of Liberty out of Papier Maché and it will look just like the real thing... but that doesn't mean that the real Statue of Liberty was made out of paper.
To claim that the French team succeeded in making a Shroud (they actually only created a face image) that meets all of the criteria of duplicating the Shroud is disingenuous. They did not.