While I agree that the article is nonsense, I have seen something slightly related.
Often at an interview, someone will ask you a question that he recently tried to solve himself.
Sometimes it's a clue that they don't know what they are doing.
This happened to me more than once.
If the guy that is supposed to be your next manager asks you such a question, especially if you try to explain a simple solution to him and he does not understand it, this is a red flag.
In that case, you thank your favorite deity and politely disengage, considering yourself lucky you found out so fast that you shouldn't be working for him.