Here’s how it went for us this year (ED1, a very selective LAC in the West): they delivered on their promise to post both admission and FA decisions at the same time, for those who submitted complete FA docs on time. But a day or two before the announcement, they sent their own FA form, asking to confirm/update information, and we were required to submit it so see FA numbers. So it looked like the “draft” was done before the admission decision while the “final” was done in the last 1-2 days. But I don’t think this model could be easily replicated in schools admitting a large number of ED candidates, instead of ~200.
We had an impression of a tight firewall between their AO and FA.