@Kozmo this claim is simply factually false.
No, the immunity being sought does not create a king who could do whatever they please. Rather it is a limited application of limited existing law, derived from the democratic process, that stands IN OPPOSITION to presidents doing whatever they want, particularly prosecuting anyone they want.
So the story gets it exactly backwards.
We have laws that protect people against purported kings who would seek to prosecute whatever they please. The court is being asked whether those limiting laws apply here.