I believe everything you wrote about here is actually cooperation between two people, and to the point of what I said, you not actively getting in the way of your direct report's career progression.

> The manager's job is to find you impactful work that a) gets you promoted and b) challenges you in the ways you want or need to grow.

To me, the comment I responded to reads like a manager actively involved in the promotion of a direct report, and in finding a scope of work that the report might find challenging so that they grow. Your comment reads like a colleague helping out another colleague to the best of their ability. Which is exactly what I expect from a manager.