A little vague would be an understatement. It completely omits the fact you have to leave the main drainage and head into trees on the left to find the climb, which isn't visible from the main drainage. We saw it because we scrambled too far right and high enough we just saw it over trees, barely. My main report HERE
includes an approach description, a key landmark photo, and GPS coordinates for along the way and the climb itself. The coordinates in the guidebook give a 300+m position error.
Let me know if this helps anyone successfully find the route.