If you're worried about it, my best suggestion is to backup your save file. I highly doubt they'd post a mod that they are aware could crash your game consistently without more of a warning. I believe they merely mean that even if you get rid of the mod, the cards stay. However I am not 100% sure. To be safe, always back up your save before installing mods.
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LMAO
Edit: My bad, they'r not missing, all of them are ranged (we really need more ranged books)
Is it in appdata? Or is it in The Library of ruina folder