So the issue isn't that we can't do something as well as Stradivarius, just that we can't figure out exactly how he uniquely did what he did.
If we're in disagreement, I don't see it.
BTW, here's an interesting article: Science and the Stradivarius
The point simply being that there's a difference between not knowing how a uniqueness was achieved (Stradivarius), and not knowing how to accomplish a task (the shroud).