Use the Turned (Right) Shoulder Plane and eliminate any Start Up Swivel in the Backstroke.
From there, delay the Release by keeping the Left Hand Palm Down (to the Plane) -- and the Right Hand Palm up -- through the Release Point and then Swivel into Impact.
They must be talking about the Turned Shoulder Basic Plane Angle. Make a Flat Backstroke Shoulder Turn, then draw your line from the ball up to the right shoulder. You can also usually get this one by drawing a line from the ball up under the right arm pit at Address.
According to the book... a Rotated Backstroke Shoulder Turn( which is a Steeper Shoulder Turn)... can also locate a Turned Shoulder Plane Angle.