Could it or will it? In terms of an effective weapon, the answer is no.
After all, in an earlier question we already learned that primitive people can armor themselves against Fluorine given fluorine in their environment. So your opponent will do the same thing, and simply use an armor layer that does not react further with fluorine.
You have described a different aspect of your plot※, though, and this is more interesting from a story perspective than your technology.
Never interfere with the enemy while he is in the process of making a mistake. You have a case where the State is following dogma rather than learning and improving — this is called Lysenkoism and could serve a plot point, just not in the way you intended originally. Your world is adhering to stupid advice from a charismatic leader, instead of adapting to their invadors and using what works.
※ hmm, upon reviewing the edit history, this interpretation appears to have been introduced by sphennings. In the original post it was just a weird way of formatting your question, maybe referring to your own notes or the story itself, rather than a book used within the story.
But, take your ideas where you find them! Having your characters doing this because they are adhering to Dear Leader’s ill-informed scribblings is a much deeper plot element, and something the real engineers will have to cope with and make work, rather than turn down and persue different designs.