You can see what was left two weeks ago here, for example:
https://f95zone.to/threads/summertime-saga-v0-20-8-kompas-productions.276/page-2707#post-5326236
Of course I have no idea what's actually happening in the background, but at least for the tracker during normal updates, most tasks, like let's say "Pregnancy Liu" appear indeed 4 times, once in each department. DC makes the art for that segment, Sploosh writes the dialog, the posers pose it and stray implements it. It's not very precise but that's how the tracker works.
By the way, the animations intself are indeed outsourced to AEHentai. DC creates the art and gets the animations back.