Board Thread:Theories and Speculation/@comment-45444155-20200806213256/@comment-46279039-20200807130011

Oh if Amazon says that :D

It is well known that the databooks are made by the Shueisha company and not by the manga author, who instead designs only the cover, as for the novels. Kishimoto not made the bio for characters, he is not an editorial pager, nor a graphic designer, he is a mangaka.

Same thing for DB, you can found this: "Though Akira Toriyama is credited as the author, he himself has admitted that Shueisha is responsible for the content."