It's worth pointing out here that it's totally possible my understanding of Rip's advice is in error, and I actually submitted that video to him to check on his opinion.
That said, look at the above text. In theory, once the bar is over midfoot and the shins have been shoved forward into the bar, making contact with them, you have (largely) established your hip position in the lift for the most mechanically efficient pull. Which is a fairly high hipped position, imho, as one can see on the actual
Starting Strength DVD.
I took some stills from the video, the one on the left being me before starting the "wave of extension," and the latter after I have "raised my chest
without dropping my hips" immediately before the bar breaks from the floor.
The "without dropping your hips" thing is huge, because if you drop your hips appreciably besides just arching your back, in order for the bar to stay in contact with your shins, you would push it forward away from midfoot. Hence my comment about needing to either A) get more flexible or B) start in an even HIGHER hip position to have the bar not travel horizontally back towards me.
As far as I can tell, I'm following his directions as well as I possibly can in terms of arching my back without appreciably dipping my hips. Stated differently, I'm not sure how I could possibly achieve a lower hip position in the pull without pushing the bar forward away from midfoot.