I know, I read it before commenting.
I'm not saying the article is about the US system. I'm saying the comment I responded to appeared to say that the US system is better, and how those countries with other systems like the UK have it bad.
"Doctors not recognizing X as a real illness" can happen, and has, anywhere. It's not a result of how the medical system is structured with regard to public/private, universal healthcare or not, and so on.
There is no shortage of stories from the US about doctors refusing to take some illness or condition as real that was later proven otherwise (or vise versa), dismissing patient concerns that were later proven, and so on.
Your last sentence (minus the specific country) is exactly what I was talking about. There is no shortage of stories where doctors don't get it right for a million reasons. There is room for improvement.
The article is about UK doctors not recognizing PANDAS as a real illness.
They even quote one doctor who refused to treat "an American illness".
The US NIH has a page on PANDAS and our (US) diagnostic and treatment recommendations here: https://www.nimh.nih.gov/health/publications/pandas
If you wanted an example of "US healthcare bad" then this is not it. The article is about UK doctors not recognizing a condition and the activities in Parliament to address the situation.