I don't think it's necessary for a therapist to highlight each and every individual technique which they might use. However, if a therapist is using an approach which is extreme enough to include verbal aggression and the mirroring of (potential previous) verbal abuse, this approach needs to be fully explained, named and consent given. Of course, I don't think there is any way to explain or justify an aggressive approach and to do so would be unprofessional or exploitative; I can only guess as to this being the reason that the therapist in question has not been explicit about what she is doing.