It's so the app still runs on ancient android versions. Use the Droid-ify client instead if you don't want that
Not exactly. It's possible to make an app run on older versions (select lower minSdk) and yet take advantage of newer features (select higher targetSdk). This one can be easily be fixed by the F-Droid developers like almost all other developers have already.
Droidify is amazing, I'd totally recommend that over the official F-Droid client any time. 👍
