I think it's perfectly possible that this T may reflect on a session, especially when writing up session notes or perhaps at other times, such as right before the next one. Telling a client he doesn't "think about the session" or whatever language he used may mean something different to him than the kind of professional reflection being spoken about. I get the sense he was saying that he didn't unhealthily ruminate about a session or allow his professional work to flow into his family or personal life.