This ban is not from the Italian Football Federation but from UEFA. Investigations were carried out and it was discovered they Juventus violated Financial Fair Play (FFP) rules by UEFA between 2012 and 2019. And the investigating body has evidence to prove that it is true.
A22 also said they have proves that the ban is only caused because Juventus with Real Madrid wanted to start the Superleague.
Wonder know for how long will Juventus remain sanctioned by Italians and European sportive authorities. It is quite ridiculous what happening there. What's the fault of dozen of players playing football and being deducted points or banned from European competitions or be kicked to Serie B!
Superleague story was faded and there is less and less talks about it but apparently UEFA is still pissed off..