Board Thread:Theories and Speculation/@comment-31477926-20170702121758/@comment-32893193-20170819020054

Yes, that's true. Because a lot of the data in the databooks are provided by Studio Pierrot and most are added by Shueisha. Contradictory ones like Inari's age. He is older in the manga, whereas the databook makes him two years younger, yet this wiki uses the databook information and not the original content as the source.