Notre Dame football program is not in any conference. Therefore, they can’t be the champ of any conference.
They beat 5 ACC teams this year. They play the ACC schedule every year and have done so since 2013.
They get all the benefit of playing a weak conference schedule without the drawbacks of sharing revenue. In 2020 they "joined" the ACC to be eligible for the covid year playoff. They got in the playoff in 2020 and promptly "quit" the next year while keeping the weak ACC schedule.
If it struts like a gobbler... roosts like a gobbler... and sounds off like a gobbler, I call it... then shoot it.