Look at the News tab in the associations page:

[Official] Important Announcement - New FA tournaments - Next season-bcad1630-a31e-42e4-aa66-d725db603243.jpg

The “promotion zone” seems to be dependent on our relative position among other FAs, not our own points alone. Looks like instead of removing Top100, they are making it the main feature! Although I like the new academy system, I have a feeling that MNK Kaskada will be right about the new associations.