Not going to make an ongoing debate about this because there's no point and it's not going to change anyone's minds on either side of the spectrum but I will say this.
The idea that canon is something re-writable is entirely fan taught and constructed rather than a law or actual definition that you can use to coin it as such. You can't use websites or online definitions made by people who assumed it did work like that. Those aren't valid sources and the original definition of the word canon was to single out what did or didn't really happen in history.
Just because they made a series doesn't mean they can't be incorrect on in universe details given the circumstances. When something is possible to happen to the series characters and universe like 3 then that storyline is canon and happens to them.
Miu's storyline is impossible to be canon within the same universe as the previous games so it by default is non canon. It doesn't matter whether the creators feel otherwise (even though they more than likely regret it given how their interviews heavily give off the impression they didn't think it was a good idea and only did it because they were mislead into thinking fans wanted it) because the originals and the information provided in them still exist to prove it otherwise. Ayane's mode is likewise non canon given the impossibility of the two series to exist in the same universe.
It's no different than something being canon in broad strokes like the Buffy live action movie. The series references its overall event, but the characterization of the characters isn't applicable to the show's universe.
Make what you will of it, but it is not a simple case of right and wrong by virtue of something being released. Things are made that contradict the truth all the time and there is no way they can coexist even if they try to tie in with the previous storyline.
Death of the Author and the simple fact that the understanding of canon is self taught rather than something provable via actual fact confirms it's not a case of delusion on my part because it requires you to think for yourself and actually recognize when something is impossible. In universe and out of universe are two different things and simply because something got released officially doesn't automatically make it canon. Otherwise both versions of the Fatal Frame movie's storyline would be canon, or the impossible to coexist within the game's universe segments of the Zero 3 Comic Anthlogy would be canon. Them approving its creation is the same as them writing it themselves because they have to supervise and accept or veto any ideas that are put into it.
This isn't the same thing as not liking your favorite character dying in the Walking Dead and pretending they didn't die because it's still possible to happen in universe. If I was going someone didn't die in the show because I didn't want them to die then I'd be delusional. But this isn't a case of that and asserting that it is is misunderstood. This is a case of something out of universe being provably impossible to happen in universe and as a result is uncanon to the series timeline because of it.
Given how the creators pay attention to the community in Japan's response to their games, and how it was a negative reaction there as well it's highly likely they consider it's uncanon as well. They very well could make a new game with Miku still being Rei's assistant and ignore 5's version all together. That would mean 5's version was never canon to begin with and was just a what if scenario that never got elaborated on as such.
Edited by AnimalLover47999, 06 January 2018 - 04:44 AM.