Sir, simply because the Catholic Church has not formally declared that the Shroud is authentic does not automatically mean that such has not been proven. Remember that it took the Church many many years to come to the understanding that our solar system is heliocentric. With all due respect to the Church, it sometimes is behind the curve when it comes to science, and it is science that has proven that the Shroud is authentic and that its image of Jesus was formed by a miraculous event.
You say that there is “zero evidence” when in fact there is a mountain of scientific evidence that the Shroud is authentic. That mountain started in 1898 with Pia’s astounding photograph and continues to be added to this day. Sir, perhaps your skepticism would be better served if you were to contest the points that Prof Fanti raised in his 2015 book, but then you haven’t bothered to read it, have you?