I felt like I should clarify my POV a bit re not bringing this up with your therapist.

I don't think it makes sense to confront a therapist about their unethical behavior and expect them to be ethical in their response.

Therapists, like everyone else, can be defensive. The behavior in this case might not be the very worst, but nonetheless flagrantly violates the rules of ethics therapists claim are so important. The usual defense therapists use to defend themselves against such charges are to distract attention away from themselves and to try to discredit the client.

I think of it like this. Would I make a meeting to let my surgeon know they botched my surgery? Would sitting down with them and talking about it make sense? I don't think so. If I wasn't certain of my belief that the surgery was botched, I could consult with 3rd parties. I certainly wouldn't book another surgery with the same surgeon to allow them a chance to prove they aren't completely incompetent.

Not everything needs to be talked through.

If you feel you must include him, I advise that you communicate your concerns in written form outside of session. I know I do much better with criticism, deserved or not, when it is not provided "live." I prefer a chance to overcome any initial impulse to react defensively or shift blame - an impulse which is unfortunately all too common among people in general. And therapists are just people.