You are absolutely correct — the upper right one is the non-ferrous / non-magnetic one. I’ve made corrections to this guide and the guide for the iPhone 5 but each time the edits have been denied, once by @Reed Danis and the previous by @Walter Galan. Not sure why they’re denied — it’s obvious which one doesn’t stick to a magnetic screwdriver. This mistake makes these guides quite unreliable and will screw (ha) with the compass.