So Camille's book and other writings give a lot more context on this - these are things to do as a manager iff you have identified that getting an IC "unstuck"

So Camille's book and other writings give a lot more context on this - these are things to do as a manager iff you have identified that getting an IC "unstuck" is the limiting factor for them to be able to reach success criteria, for them to see their own success made incontrovertible in the team's eyes and in their own. Saying a manager's "output is just written feedback" does the role, and her take, a disservice - her very first chapter describes good managers as ones "who care about you as a person, who actively work to help you grow in your career." So take the post as what it is - one of many tools in a toolkit for being an effective leader.