Priests are bound to confidentiality for whatever was confessed to them during confession. It’s part of why people confess to them. Priests are then able to encourage people to seek help, talk to the police, etc., but they themselves aren’t supposed to report what is said to them. In a few flavors of Christianity, including Catholicism, confession is considered a sacrament. It’s between the believer, their priest, and their god.

That’s what this ruling is about. Priests are still mandatory reporters for anything they learn outside confession.