Let's not forget that Vivre Card Databook is fully canon
Whatever Oda puts his official approval on has official value, no matter who wrote it, this is something people should deal with
Fun fact, 99% times the Vivre Card does nothing bar re-state what the manga or SBS already stated, so basically nothing new
And in the 1% the Vivre Card reveals info that is totally canon, like Morgans having eaten a DF, Roger's sword being named Ace, etc (all first revealed in Vivre Card... then Oda confirms in SBS)
Also
Official Vivre Card page dedicated to fixing eventual mistakes
https://one-piece.com/vivre/revision/index.html
Oda himself directly acknowledges all databooks as a reliable source of information, that he encourages people to use
But sure, some fans know better than Oda, right? The Greg guy who might be Oda's 939593748th helper knows better than Oda, right?
Laughable