Well, not exactly new -- the tests date from the late 90s to the early 00s. Still, I keep track of Shroud tests at least casually up to date, and I hadn't heard of fiber tensile strength tests before!
There is a metric ton of scientific data pointing to a suitably ancient origin and scientifically unknown process, unduplicatable by ancient methods, for the generation of the Shroud; and really only test against an early date, the Carbon Dating tests. There is conflicting information about those tests: for example, the people who did them (I've read their reports) are VERY VERY CLEAR that they did NOT test the medieval patchwork: they were careful about not taking material from it or its seam, and they could have easily told the difference when setting up the test that they had the wrong material. On the other hand, the two men chiefly responsible for inventing the two kinds of standard Carbon dating methods available, both have agreed independently that the tests had been botched somehow and should be redone.
It's grimly amusing to watch modern reconstruction artists trying to claim they've proved how the Shroud was made by managing to mimic a few key details -- while being totally unable to mimic all the key details. (And their methods are mutually exclusive so couldn't be combined to create the end results.)