Your initial question sounded like it dealt with LEGAL confidentiality, and that is what those who responded to you were talking about. Your definition of confidentiality is much broader than the legal one, it's an ethical one. That doesn't mean it's invalid, but you should understand the confusion of those who responded to you. As that website says, law and ethics do not overlap perfectly.

If you're saying that in your view, your therapist breached ETHICAL standards of confidentiality, sure, absolutely - that's your call and yours alone to make, and you obviously have made it.