Whitfang,
At Tru-fires' website under F.A.Q. the question is asked, "Do I need a tru-rotating release if I shoot off of a string loop?"
Their answer is, "No you do not. While at full draw, if you torque your wrist either left or right slightly, your string loop will take up the torque, transmitting only a small amount of torque to your bowstring."
Though it may not be necessary, I agree that if the release rotates it would make it virtually torque free when used with a string loop, thus making it a better choice.
Thanks for the reply,
Stan