If i read it correctly the uninstall/install part is for the F-Droid Build Status App and not for F-droid itself.

I recently found another FOSS app for scanning documents. The OSS Document Scanner can be used to scan documents by making a photo or importing an image file. It has OCR and can export as PDF. It is MIT licensed and can be downloaded from play store or via f-droid from IzzyOnDroid repo.