A manager produces through others
When someone leaves a technical role and becomes a manager, the yardstick changes. Before, your value came from what you did with your own hands. Afterward, it comes from what the group delivers. Grove starts from this shift to say that a manager needs to learn how to produce through other people, not alongside them.
That sounds obvious, but plenty of people bring their old routine into the new job. They keep solving everything themselves, answering every request, and putting out fires, while the team waits for their approval to move forward. The result is a bottleneck wearing a boss's badge.
Think of a neighborhood diner with a cook who wants to wait on every table himself. While he runs back and forth between the stove and the dining room, the line out the door grows. A good owner organizes the kitchen, trains the prep cook, and keeps an eye on the whole operation. Management works the same way: you gain scale when other people can get things done without you in the middle.
