if the reporting is correct, this was not the standard DNA test. It was some kind of general family DNA check. Several states have outlawed using that DNA because it casts too wide a net.
The authorities would have to have a chain of custody evidentiary DNA to tie him in. If this is the case he is toast.
He gave his DNA up, supposedly voluntarily, after teh familialDNA was used to get his n aaammmmmmmeeeeeeeeeeeeeeeeeeeeeeeeeee