Idk honestly, maybe Square thought that the guide became too restricting and decided to disregard it. Wouldn't be the first time an external piece of media has been rendered non canon in a compilation like this. Hell certain series even make actual games within the series non canon if they begin to become too restricting or conflict with future plans.
Star Wars is a really big example of this, the only surefire canon is the movies since that's what started the franchise. Same thing applies to FFXV, the game is the main source of canon and if the devs feel like the guide has limited their creative freedom then I wouldn't be surprised if they ultimately decided that it was expendable in the grand scheme of things. The movie itself doesn't seem to contradict the game since it doesn't mention any really explicit dates and the exact time stamp on the anime is entirely left up to our imagination as well. So I doubt that they'll be rendered non canon but the guide provides a lot of specific info that they never originally intended to put in the game and once you do decide to include that stuff in the game you have to tweak it so that it fits in, in an enjoyable manner.
I doubt people would find it enjoyable if Ardyn's episode was him entirely just walking about non violently scheming and quietly working on his political career within the empire like the guide originally implied. It would work in a movie or in written form sure but within in a game you typically wanna be able to enjoy playing the game. So they likely had to spice it up so that it's fun for people to experience it within the form of media they've ultimately chosen to adapt the story in.
Honestly I'm fine with the game disregarding a guide, in an ideal world they'd disregard all the external media and adapt the entire story into the game even at the cost of changing previously known info for the sake of keeping a consistent and fun experience but yeah Episode Ardyn and the game is more canon in my eyes than a guide book at the end of the day and I won't really be mourning its loss.
Star Wars is a really big example of this, the only surefire canon is the movies since that's what started the franchise. Same thing applies to FFXV, the game is the main source of canon and if the devs feel like the guide has limited their creative freedom then I wouldn't be surprised if they ultimately decided that it was expendable in the grand scheme of things. The movie itself doesn't seem to contradict the game since it doesn't mention any really explicit dates and the exact time stamp on the anime is entirely left up to our imagination as well. So I doubt that they'll be rendered non canon but the guide provides a lot of specific info that they never originally intended to put in the game and once you do decide to include that stuff in the game you have to tweak it so that it fits in, in an enjoyable manner.
I doubt people would find it enjoyable if Ardyn's episode was him entirely just walking about non violently scheming and quietly working on his political career within the empire like the guide originally implied. It would work in a movie or in written form sure but within in a game you typically wanna be able to enjoy playing the game. So they likely had to spice it up so that it's fun for people to experience it within the form of media they've ultimately chosen to adapt the story in.
Honestly I'm fine with the game disregarding a guide, in an ideal world they'd disregard all the external media and adapt the entire story into the game even at the cost of changing previously known info for the sake of keeping a consistent and fun experience but yeah Episode Ardyn and the game is more canon in my eyes than a guide book at the end of the day and I won't really be mourning its loss.