@A33Zab
Maybe the drawing hasn't been as helpful as I thought, but check the ANU position again. The 0° position is represented by the line marked Attitude and the 13° NU is 3° above the Horizon line. The Horizon to Attitude angle represents 16° pitch.
As a matter of interest, the drawing was originally posted in the AF447 Wreckage Found thread and thoroughly dissected over there! In fact the biggest concern expressed in that thread was the original THS camber which favoured the top and has since been changed.