Yes, this. Also, no way in hell Brooks or any other athlete would say "yeah, I'm in the middle of the appeal and I don't think it's looking good."
Plus I ventured into the rules section of the anti-doping policy and he's got a few things going against him based on the possible ways to get a retroactive TUE applied, which sounds like he needs because he said he showed up and simply informed them that he was on it (indicates he's aware its a banned substance - removes ignorance claim):
Emergency or urgent treatment exception - Vyvanse for school is not an emergency by any means.
Insufficient time or exceptional circumstances preventing athlete from obtaining TUE - Brooks had been competing under UWW / USADA / WADA rules since at least his U17 days. Plenty of time and opportunity to get one. Don't start using the drug until you have one, dude.
Due to national agencies not requiring TUEs - I believe NCAA and USA wrestling require these.
Athlete is not considered an "international athlete" prior to testing - Brooks had been competing in U17s, U20s, U23 qualifying events for years, establishing him as an international athlete (I think), unless the break between U20s and U23s took him off the list.
Substance is only prohibited out in-competition - not the case for Vyvanse.
I'd be interested to hear what people more in-the-know have to say.