I agree with your interpretation, Malloric, whith the one following exception -- soccer mom doesn't appear to have actually looked around before accelerating when she rolled the stop sign. Given the relative invisibility of cyclists to some motorists, it's a real concern.
I wasn't there, so I won't say more lest I make false assumptions. Bottom line, I think Idaho stops are OK, but we should remember that other vehicles already at the intersection have right of way and that we should be vigilant for inattentive drivers since we don't have tons of steel wrapped around us. Best case scenario we're riding on top of 7-8 pounds of steel plus components.