The justification makes perfect sense. This Anti-Feature is applied to an app that contains content that the user may not want to be publicized or visible everywhere. The marked app may contain nudity, profanity, slurs, violence, intense sexuality, political incorrectness, or other potentially disturbing subject matter. This is especially relevant in environments like workplaces, schools, religious and family setting…
I feel like you didn't read the discussion at all? One of the apps does not contain any Bible verses, it is used to track which books, chapters and verses you've read.
These people can perfectly well distribute their apps without F-Droid's help, they're not refusing to sign their app or somesuch.