HN user
They didn't find DNA from any of the five. They found the DNA from a sixth person the couldn't identify. This person confessed to the crime years later (after the statute of limitations passed), and also claimed he acted alone in that particular attack (the five were part of a larger group participating in multiple random assaults on bystanders that night).
I'm puzzled: did they actually put five people in jail, even though there was actually one perpetrator?
It's actually a pretty complicated case. I'd recommend reading both the recommendation from Morgenthau to vacate the convictions[1] (which ended up happening) and the Armstrong report[2] (which came to the conclusion that the Central Park Five were most likely involved in the attack). Doctors involved in the case as well as the victim still believe that there were more than one attacker[3] (the victim has no memory of the attack). The only person who's DNA was found there (who wasn't part of the five) is the person who claims that there was only one attacker (he confessed to the crime and made the claim that he was the only attacker after meeting one of the five in prison).
Like I said, the best way to get an idea about the case is to read the two reports. Most of the news articles that cover the story don't do a great job.
[1] http://big.assets.huffingtonpost.com/wise.pdf [2] https://big.assets.huffingtonpost.com/Armstrong.pdf [3] https://abcnews.go.com/US/case-settled-1989-central-park-jog...