I know there are legal precedents and nuances, but sometimes common sense really does prevail.
The NFL via Roger Goodell, as commissioner, punished Brady for being more likely than not generally aware of something.
The NFLPA appealed that Roger Goodell, as commissioner, did not have authority in the CBA to suspend for that reason.
Roger Goodell, the arbitrator, first ruled that Roger Goodell the commissioner did.
But then Roger Goodell acting as arbitrator changed what Roger Goodell, as commissioner stated in his punishment to something else.
In sum, RG arbitrator said RG commissioner was within his rights because RG arbitrator knows he really meant something different than he wrote, and ruled.
There is just no court in the land could find any justification for that series of actions.