Well perhaps this contradicts that. Who Knows, since the corners where the C14 testing were done indicates early medieval times due to it being paraded around city to city. What is known is that the image is on the underside only not soaked through with effluence from any wounding and not an image producible with the known technologies of DaVinci's time.
https://aleteia.org/2018/03/28/this-3d-carbon-copy-of-jesus-was-created-using-the-shroud-of-turin/