ehhh, nah not quite. couple reasons
1. people don't go into therapy to work strictly on how they treat people
2. the therapist has a much bigger job than to sit and allow the patient to act inappropriately
I will say that the quote isn't totalllly off. In therapy people practice relationship skills with their therapist and eventually they use the skills on people outside the relationship. But to say that's all therapy is to me is incorrect.