That story again?
The chain of evidence for that shawl is extremely questionable, as ut only entered evidence like a decade ago and was previously in private ownership
The article doesn't go into detail about the type of DNA analysis but previous if it was based on mitochondrial DNA it could be very inaccurate
That's like saying "A diary entry from 1888, found in private ownership in 2010, said that Jack the Ripper wore glasses. Kosminski wore glasses, therefore we can say with 100% certainty that he was the murderer!"
Also, don't believe articles that use phrases like "100% certain". If forensics were this good, we'd have no need for courts