Well, @kaena, if your wish is #droidrec to be in #fdroid library, I give you an advice : ask to #droidrec dev (ie jorik041 or SerpHawk maybe via GitHub at https://github.com/jorik041/DroidRec or at https://github.com/SerpHawk/DroidRec ) by opening an issue.
You can also ask to @fdroidorg team devs why you can't find #droidrec at https://f-droid.org/packages/com.yakovlevegor.DroidRec/
For your information, Gargron is the Mastodon's dev (more informations at https://en.wikipedia.org/wiki/Eugen_Rochko)