The DukeBasketballReport piece is more than a little bit biased. There is a medical form for the NCAA that can be filed in order for players to take those drugs, so they are not 100% "banned PEDs". From literature I have seen, ADHD drugs such as Ritalin can improve mental awareness even in people without ADHD, but doesn't improve physical performance.
The Athletic article does say that the coaches pushed for athletes to be diagnosed with ADHD for extra accommodations such as untimed tests. That is a concern, but that isn't the largest arguments in the Athletic's article. The biggest argument is that the concussions research didn't include the ADHD diagnosis of players out of the report, which calls the entire study into question. The Athletic article is about a research study at UNC that they claim was flawed. The DukeBasketballReport piece implies that UNC football players were regularly taking large amounts of steroids to get bigger, faster, and stronger.
I wouldn't take a hit piece article from a rival as "evidence" that UNC is in trouble.