Stoker had informants or he himself? proof of that? cause it seems like you just pulled that one out of the air there, he was informed by lara. Whom we know is part of the oblivion war and understands both identity and how mortal belief effects it.
Raisins and Quantus have already provided the quotes, so yep, Stoker had informants. Lara Raith. We don't know exactly how she got the information, but it's not very hard to figure out imo. She probably collected it from various sources. And maybe Stoker himself was encouraged to figure some things out. How they put it all together isn't that important though, imo. The thing is that it was information about weaknesses of the Black Court that was already true. You were arguing that the publication of those weaknesses somehow was a catalyst for the methods to become effective because people believed in them. I only pointed out that this was an over-simplification of the way how belief works in the DV in my very humble opinion. People don't start believing in things because they read about them in a novel. Ok, some do, but that's not the normal case. I'm sure that very few readers of the Dresden Files rely on crying out "Forzare" at their opponents when they end up in a fight.
Now, I don't argue that it isn't possible for some of those methods to be more effective if people really believed in them. Especially the faith magic. Simply because people would have more faith or stronger faith if they started to believe that it can help them against monsters. That makes the attack stronger, not the vulnerability to it of the monster. But would a belief in the effectiveness of garlic against BCV increase the effect? I don't think so. For some odd reason, BCV can be killed by throwing garlic at them. Maybe garlic is a substance that is especially life-affirming, so much so that the Necro-magic that holds together a BCV implodes upon contact. Why doesn't the same thing happen if you throw an apple at the creature if someone truly believed that it should be more effective because they don't like garlic and apples are more life-affirming? Because it doesn't work and the idiot gets killed relying on a substance that just doesn't have the same effect and his reasoning was faulty because it wasn't the vitamins or the taste but one of the oils that can be found in garlic has a very specific reaction to the BCV magic aura. Theoretically, some nuts that grow in Indonesia would work as well, but nobody has figured it out yet because it's still a mystery why it is garlic of all things out there that can kill the BC.