Everyone misinterpreted the -blam!- out of that. Literally just means most grimoire cards have always been folklore because they are written from the perspective of people long ago or very speculative. You know Pujari's shit about the ghost that seems like a dream sequence yeah folklore. Ya know the stories about Saint 14 bashing the kells skull with his own? Well that might have happened but who is telling the story? It's not written from Saint 14s perspective so who wrote it? A nearby soldier? Why wasn't that solider helping were they wounded? We don't know all of these things 100 percent and therefore it's folklore. It's like when you retell stories of any historical figure. Some of it can be noted with evidence but most of it is just stories passed down. Like the grimoire.