Read more Dave Tate then before you keep talking about something you no nothing about. If you question Dave Tate then you are more ridiculous than I thought.
Since I do like to educate... The cable bicep curl is most definitely a compound movement.
Everything the movement hits is as follows:
* Biceps Brachii
* Deltoid, Anterior
* Trapezius, Upper & Middle
* Levator Scapulae
* Wrist Flexors
Those list are just for the arms. As with most standing cable exercises there is some tension put on the core also especially if you take a step or two away from the cable machine.