Yes. On Friday PBS interviewed Ambassador Adela Raz, Afghanistan's Envoy to the United States and asked about this. Her response seemed a bit flimsy and not very convincing. You can see it here at 7:05 mark:
When she mentioned air support being pulled back, I wondered if the U.S. could have still kept some order through that alone. It made me think of how the Americans maintained no-fly zones over Iraq for a dozen years after the Gulf War.
https://www.pbssocal.org/shows/newshour/episodes/august-13-2...