First, he was not “exonerated.” Second, I seriously doubt that his confession was “false.” I read the appellate decision from the 1990s. There’s a lot more to the story that suggests this guy is guilty as hell. Another Soros DA working to undermine trust in the criminal justice system. Sure, everybody admits to a murder they did not commit.
He was “excluded” as a suspect because he was a non match for all the copious amounts of dna evidence on the victim and the murder weapon.
That’s about as exhonerated as you can get.