"Moral of the story: even insane-looking problems are sometimes real."
Isn't it relevant to note that this problem was not real? It seems to kind of undermine the point if the author did not know of any insane-looking problem that was actually real, and had to make one up...
If you're hung up on the fact that the story isn't real, it means you aren't thinking about the moral of the story. You're focusing on the wrong thing despite the fact that the insight is being spoon-fed to you...
Incidentally (though respectfully... really!), this is a textbook example of pedantry, and it's the bane of our profession.
More to the point, fiction often points to truth in ways non-fiction cannot.
It's not insightful if insane problems never actually happen!
It's fine if the author uses a fictional story because it flows better. It not fine if the author uses a fictional story because they can't source a single real one.
I've seen and read lots of parables that end with the phrase "moral of the story" when distilling down the core lesson behind the tail for the convenience of the audience. Moreover, the term "story" doesn't necessitate factual content - it's generally used more to convey an entertainment piece of which the content could either be factual or entirely fictional.