In your shoes I would feel so much better if I framed it differently. "Communicating by skipping a session" sounds very disempowered and passive-aggressive (to me). It sounds like the action of a person who has no good options.

If therapy is a forum for practicing relationship skills, why not use this opportunity to take all your power and take care of yourself? As in, by email or snail mail if T doesn't allow email: "Therapist, I have been feeling that therapy has been not helpful/very triggering/too intense/unproductive/whatever lately and I will be taking a (few) week(s) off to regroup. I will see you in September." Or alternatively just leave a VM saying you need to miss the next appointment.

When you go back, say that you were not happy with how X was going and needed some time to mull that over. Don't be made to feel that your choice is somehow not legitimate or that you are not allowed to make that call.

Take charge. Treat the therapist you employ with professional courtesy, remembering that though the relationship may be fraught, YOU are paying THEM for this job. If they are doing shoddy work, communicate your dissatisfaction. If their work is fine but you need to modulate the intensity or it, you can say that too.