Fictional Fans

Not an answer, just something that piqued my curiosity, hope that's okay?

Given that the definition must include both 'fanfic that is only available for money' and 'stuff done with the rights owner's expicit approval', I'm wondering where that puts tie-in novelisations and the like? By the definition given, it seems those unquestioningly do count as fanfic... but I'm wondering if the addition of official logos, branding, copyright, etc affect whether or not those things are considered fanfic, even when they're officially labelled non-canonical?

(Again, I'm not offering any opinions myself, I'm genuinely just curious and interested in others' thoughts, as I know tie-ins are often seen as a grey area.)