That story was likely a bunch of hokum. The “shawl” has no provenance and can’t be connected to the murder. There was no independent DNA testing done, and the techniques used in gathering and analyzing the DNA were not standard practices. So besides the subjectivity of the tester, the accuracy of the test itself is questionable.
In fact, the man making the claim won’t reveal the identity of the supposed Kosminski relative whose DNA he used for comparison, so as far as anyone knows, she may not even exist!
Good point. Maybe the relative does exist.