On the second part I can kind of follow your argument. But what has this got to do with the Peter Principle? I didn't see the argument being tied back to people

On the second part I can kind of follow your argument. But what has this got to do with the Peter Principle? I didn't see the argument being tied back to people being promoted until incompetence, which is not even what the article suggests. But the P and Q argument does make sense. IQ is helpful, charisma is helpful. If you have a lot of charisma you need less IQ to get there. I find that part of the argument statistically sound.