User blog comment:Kogath/Monster Hunter: World Discussion/@comment-6050823-20171102200128/@comment-5158920-20171106124212

There's no video evidence of them stating as such and they have only said a few things are canon. Everything in those books is mostly concept art that never made it to the full games. Concept art is never canon unless it's the final design. Now the ancient civilisation is actually mentioned in the games and there were in game lore books in MHF2 and MHFU that explained some stuff however anything to do with the dragon war and EDW never panned out.