Is that because at the moment of confession someone who is Catholic believes that he or she is not speaking to a human who just so happens to work at a church, rather to G-d through his messenger/medium/portal who happens to be a human?
So a priest cannot say anything because no one actually told “him” and “he” technically wasn’t even there as himself. He was speaking for G-d according to the Catholicism Christianity and G-d cannot be an informant?