No, the linked story does not show DNA genealogy leading to a misidentification. It shows it leading to a suspect, who is then exonerated by that same DNA evidence.
“Michael Usry Jr.: They sent me an e-mail … and it says, "Michael Usry Junior, we just wanted to let you know that your DNA did not match our crime scene DNA, something you already knew."”
That is a whole-hearted acknowledgement of exoneration.
No one claims that DNA genealogy is foolproof. It always leads to possible identifications, which are then checked out with standard DNA techniques.