This is beyond unnecessary and I suggest that you not allow this procedure to be done on your incision site. There is still some healing going on with the soft tissues and this seems to me to be a brutal attack on them.
Were you complaining of pain or tightness in your IT band that may have led your therapist to try this procedure? Frankly, I've never heard of such a thing for a recovering knee and I imagine you were quite sore afterwards. Sometimes I wonder where these therapists get ideas like this!
Also, I merged your latest thread with your original recovery thread. We prefer to keep all your updates, questions and concerns in a single thread so that it is easier to go back and read your entire history at times when responding to you. Having a single thread also gives you a complete picture of your recovery journey. Sometimes it's helpful to go back and read to see how far you have come.