Maybe it's just me, but putting "health issue" in quotes in regards to an ADHD medicine is very insulting. ADHD is a very serious condition than can lead people to commit suicide, have violent outbursts, fail out of school, not be able to get a job, etc. With treatment, most people with ADHD can live a normal life and you would never know anything is wrong, but without treatment it can be terrible to have. Saying that it's a childhood condition is also incorrect. In fact, adult ADHD is becoming a major area of research because it's more prevalent than we had previously thought with more people needing help for it.
I know mental illness is stigmatized or even not recognized as existing in other cultures (perhaps in Eastern Europe considering the reaction to Simone's condition), but in the US, mental illness is seen as something we need to help people out with. Because people with mental illnesses deserve to live a normal life or as good of a life as we can help them achieve. In some cases that involves medicine, like for ADHD.
Also, as
@MacMadame said, ADHD medications that are not performance-enhancing steroids. The only advantage Simone gets from these medications is being able to concentrate on par with a other gymnast. Although, the ADHD itself may be an advantage in that it gave her the energy to want to keep practicing and practicing as a kid, even at home.
As for the cold medicine issue, I agree that that's wrong. Athletes should be allowed to take cold medicine. Maybe they'll need documentation from a team physician to confirm you have a cold, but there's no reason anyone should be banned for not wanting to be coughing or blowing their nose endlessly for a couple days.