I think your T just said this as standard procedure. As a professional she needed to clarify the statement "within reason" because I think it can mean different things to different people.

I think of it like when you are telling your most trusted friend a secret. Even if I know they won't repeat it, I'll still remind them "please don't tell anyone". It's not that I think they will, but I still need the disclaimer to be sure we're on the same page.