Not being able to recreate the Shroud, has no bearing on proving its authenticity. It is a fake. The earth was always round, but it had to be proved that it wasn’t flat before anyone believed.
That was me a few years ago. I was sure it was a fake. And I didn’t see anything wrong with thinking that while I sought evidence to support that position. Now, after much study, I say it is probably real. So I learned something about the value of having an open mind.
Regardless, my faith did not change as, very slowly, I became convinced that that the shroud was real. At least I don’t think it changed.