There's only one small section on the high bar squat that comes down to (paraphrased) "low bar uses more hips." Nothing on the range of motion being sacrificed. Perhaps you can give a more direct answer? Other than "read the book" of course.
Seriously? The same height?
Give the n=1 experience of myself (and many others), I could lift more weight using a sumo stance than a conventional stance. I'm not disputing that one can lift (slightly) more with low bar. I'm asking why the same standard (sacrificing ROM for more weight) isn't applied to the deadlift.
Put on your reading glasses. I said hip travel, not bar travel. Even if it were measured by bar travel, you do realize the bar in the "HIGH bar" squat would start up higher, right? Or did you forget the difference between high bar and low bar squats? In other words, the bar would have to travel longer in a high bar squat to end up in the same position as the low bar squat in that picture.
What are the criteria that Starting Strength uses for choosing a movement? Why might properly-performed high-bar and low-bar squats use different ranges of motion based on these criteria? Why might Starting Strength prefer a conventional deadlift over a sumo deadlift based on these criteria?