This question asks whether there is an "in-universe" explanation for a particular piece of lore in a particular setting. Note that there is already a meta question about the question's topicality. The appropriateness of the question aside, how does one provide an acceptable answer to such a question if the answer is "no"?
As it happens, the lore question that occasioned this meta question is susceptible of a "yes" answer, and one was eventually posted. But the larger problem remains. If there is no clear "yes" answer to a question of the form "Does X exist in the lore," then the answer requires proof of a negative. As far as I know, the only way to prove a negative is by inductive reasoning. Induction depends on supportive argumentation to make its probabilistic conclusions more probable. Where the question demands that an answer rely on in-universe sources, and no such sources exist from which to argue, what is the best practice? To provide information the querent might find useful even if it doesn't actually answer the question? To simply leave the question unanswered indefinitely, as suggested here? Something else?
Reviewing other potentially related meta questions, I observe that the querent wasn't asking about the existence of a product, but the issues raised seem similar.