User blog comment:MrGenial11/Yoshihiro Togashi x Sui Ishida (Tokyo Ghoul) interview/@comment-1460085-20160604182900

The chapter is already translated by Mangastream. Considering that Togashi approves of the storyboard, and even shows interesting on working from where Ishida took it, I guess it is safe to say there is some degree of canonity involved. I think we should put the events of the storyboard along the characters introduced there BUT clarifying the status of the storyboard as semi-canon so to speak.