Confessional does not grant legal immunity
As an Irish person living away from home I have had my eyes opened by seeing how differently things work in other countries.
It is bizarre in the extreme to witness the Irish Catholic Church dancing on pins in seeking to defend the confessional, as if somehow entering a wooden box in the corner of a church transports us to another galaxy. It doesn't.
A person who enters a confessional and tells a priest that they have abused a person (or broken any law) has admitted committing a crime according to the law of Ireland and I'm not aware the confessional box was ever granted some legal immunity.