Except in this case it was the perp who wanted to talk... and talk... and talk.
Reading the article, it sounds like the guilt he carried became too much of a burden.
That’s certainly what it looks like. Like I said, I don’t see anything there that will get the confession thrown out. It’s the lawyer’s job to try, though, and I don’t have a problem with that. It doesn’t look like the police did anything untoward, but I’m not willing to just assume that, and neither should the law. That’s why we have the system we have.