I think he loses as it was not his DNA in the genealogical database and the owners of the DNA put it in the public domain. It led to him being the suspect and they got his DNA from discarded items already ruled not needing a warrant.
That said, there might be other and better cases that warrant a warrant (npi).
“It led to him being the suspect”
I think that’s the key. A relative’s DNA put them on a path that pointed to a suspect to investigate. To me it’s a lot like using info from a tip line, but maybe that’s not the best comparison.