Board Thread:Naruto Discussions/@comment-3965545-20160202201023/@comment-142748-20160203071221

QuakingStar wrote: No one stated he wasn't either so that's another thing you can't prove. Which is the purpose of this thread. QuakingStar, your assumption that Itachi was sick his entire time in Akatsuki is without any basis.The only time we know he was sick is in Part II. That's it. To prove this assumption you have to provide the proof in a statement from the manga or one of the databooks, otherwise you don't have the evidence to prove this assumption and assertion. Its the same reason why my assumption that Majestic Attire: Susanoo required Complete Body - Susanoo.

That particular novel is non-canon. Its time period doesn't fit in with the manga and it contradicts what we know about the Mangekyo Sharingan. Unlike the Naruto Hiden novels and Naruto Shinden, it doesn't fit anywhere well in the manga nor is said to be canon to it.