@sll I'm afraid you might have misunderstood (or I did).
There's F-Droid the repo and F-Droid the app.
@mondstern says that apps get from the Izzy *repository* to the F-Droid *app* on your mobile faster than they do from the F-Droid *repository*.
But because an app is available on the izzy repo does not mean it will ever be on the F-Droid repo.