I don't know anything about the theory but found your post really interesting. I would get really annoyed with a T who took that tone with me. In fact, I get quite annoyed with a lot of people because they take 'parental' roles to me. However, what you say makes sense because I am generally very much stuck in a child mode
I'm intrigued by your being told 'I don't know' comes from a child state... Is uncertainty not compatible with adult state?