Since this app updates so often and it takes so long for app stores to have the latest update available, it would make sense to have a link to Obtainium right next to the links for F-Droid, Google Play, and the GitHub release page. Slide for Lemmy does something similar, though it is arguably more important there, as the app is not available on any store yet.
Here is a previous thread on the subject of Obtainium that may answer your questions.
https://lemmy.one/post/392829
This particular question was answered about timely updates through Obtainium:
Just last week, Obtainium gave me a Liftoff update, and when I checked the patch notes on GitHub, that update had been published literally an hour ago.