I am assuming that the point is, when you start in your team's shoes and then get promoted to team lead, your team knows you are capable and that you have well reasoned opinions. Hopefully.
It sounds like he is implying something, as in everyone switches jobs, but he specifically points out he changes jobs after being promoted, which I assume he did for a reason. But I cant tell if its because he was unhappy and for what reason. Otherwise why would he specifically point that out?