Ummmm.... Almost. With these carbs, airflow plays at least as big a part. With the throttle WFO and the engine loaded down so that it's barely turning, there isn't much air moving. So, with little pressure drop across the slide, it stays shut and you run on the idle and transition jets wich are fed by the pilot jets.
On the other hand, coasting down a steep hill at redline with the throttle on the idle stop, some air is still going to flow because you are pulling a huge amount of vacuum and the slides might open a little bit, putting you partly on the needles and mains.
