This is pure politics. In politics when you fuck something up and someone makes it public you need to act like you did and like you really didn't do anything that bad. Easiest example is whatabouthism. Yeah you caught me fucking a secretary but remember when that guy from that other party fucked 2 secretaries 27 years ago? Now that's just wrong.
In this case, because those "judges" sitting in this false court are in reality simply sport politicians, they had to figure out a way to acknowledge that what happened was wrong but at the same time to not take the blame of "we fucked up". And it seems like the only way to do this was "yeah that sentence was wrong because of procedures, therefore we need to make it again". This gives them and the general population time to forget about the detail of the case and in 3-4 months when it finally ends it won't be as loud as it would now.
On the plus side - if my theory about this being a strictly political maneuver is right - in most political cases of such magnitude when the guilty party gets caught, like FIGC did, and it is now mostly common knowledge that they fucked up... when they get caught and manage to silence this thing out, or stretch it in time, they usually don't do the same mistake again in order to avoid awekening the uproar from the common folk, which would be even bigger this time around. This lets the political dildos survive and don't pay any price like resignations etc. and at the same time the original victim (Juventus) is too happy about this being over to follow through.
What I'm sayins is that in my opinion what will happen when it's said and done is 0 reduced points for this or next season and maybe a fine.