Am I the only one who is right-handed, but doesn't hold their iPhone like that? I rest the bottom of the phone on the top side of my pinky finger, which puts it higher in my hand and doesn't require the "hook" to swipe right-to-left in the bottom half of the screen.
The author's grip puts the home button halfway outside his "thumb zone" forcing an awkward claw whenever you need to multitask or return to the springboard. Our grip puts the home button in a much more natural position.