That's not even going into their de facto slavery with foreign construction workers, environmental damage, and sexism.
This article is not about someone's innocence, it's about the system and processes, some of which are considered illegal by the UAE's own constitution.
The hook in the article is the following claim: "foreigners doing business in Dubai are often unaware that local politicians and businessmen – elite figures are often both – may use the courts to pursue vendettas, settle scores or raid assets they covet. Even the smallest debt can lead to years in jail. Cornelius is just one of thousands of expats who are either imprisoned in Dubai after falling foul of the emirate’s draconian legal system."
So they are presenting Cornelius as an innocent, almost random person with a small debt, who is merely an example of what could happen to anyone doing business in Dubai. That's a lot of people and thus a topic of general interest.
Later on we learn that in fact Cornelius was even by his own admission a massive fraudster, operating in the hundreds of millions range. Yes, Dubai's court system sounds like a joke. Not a good look for them. But this guy is hardly a source of generalizable lessons that might interest other people especially as it becomes clear later in the article that he appears to have been specifically targeted by the Sheikh himself.
I'm actually quite appalled at how far the Economist has fallen. I haven't read it for years and didn't expect such a manipulatively written article from them.