I am not sure. If you check the source they link in the Izzy repo it still says that they are looking for maintainers and there have been no commits in two weeks. So it is not quite there yet, but apparently they have solved the issue with the database not updating, and probably the app is usable by now.

It is great news that the Izzy repo is providing the app there.

It is not listed in F-Droid. Maybe they will do it in the future, that is currently the only issue on GitHub https://github.com/chenxiaolong/RSAF/issues/50. Until then, you could use Obtanium.

Looks amazing!! Does anyone know if there is something similar for GIMP?