There's incorrect information there though. The meeting WAS listed which is why they thought it was mandatory. The link you gave says the meeting wasn't listed, as though they were trying to hide it. Now, I know you might say I'm being pedantic that there's no difference, but this is EXACTLY why the Patriots were dinged.
If the meeting was listed as OPTIONAL, there would be no problem here, but because it was on the official schedule, that made in mandatory.
Again, it sounds like I'm not pointing out a big difference and it's not even worth making my post. OK, I get that. But this is literally why they ruled against the Patriots.