I doubt if the psychopath Brendan Smyth went to the confessional. Sean (Cardinal) Brady (as papal notulist when Brendan Boland was interviewed in 1975) did nothing. For Smyth it was business as usual right up to 1990s' AFAIK.
https://www.bbc.co.uk/news/av/uk-northe ... ndan-smyth
For record, Sean Brady was centre stage last Sunday in the Phoenix Part, Dublino with il Papa and he received communion. No good deed goes unpunished.