Which is not what is happening in this case anyway -- the confession in question is the confession of the victim, not the perp -- so you're way off base.
For those actually interested in the plaintiffs complaint:
The petitioners claim[ed] Bayhi was negligent in advising the minor regarding the alleged abuse and failed his duty as a mandatory reporter in compliance with the Louisiana Children's Code. It also holds the diocese liable for failing to properly train the priest regarding mandatory reporting of sexual abuse of minors.
The priest effectively shielded the perpetrator by failing to properly report the crime, and by failing to advise the victim of the proper course of action. That amounts to protecting the molester, regardless of whose confession he heard.
I am not sure why this girl did not go to her own parents, a teacher or someone outside the Church? That's what makes this whole thing shady in my view. Someone might be trying to get paid. OR she was a willing participant.