No, doesn't work that way. Deleted scenes don't count either, fyi. That they only bring up the idea outside of the film is hardly unintentional IMO.
And why, exactly, does creative intent not matter?
Mainly because if we counted all the different conflicting visions of the
Trek-verse that all the different writers and creators have brought to the table over the years, our heads would explode and our ability to discuss canon
at all would be annihilated. So the only thing that we can consider authoritative in canon discussions is stuff that happened on-screen in a (live-action) official
Trek production on TV or movie screens.
However, neat trick people often forget: just because there's no evidence to support a particular interpretation of canon doesn't mean that interpretation is wrong. As long as it doesn't
contradict canon, it can be legitimately held and argued. And there's nothing about the "Many Worlds" interpretation of
Trek XI's theory of time travel that contradicts anything in canon. That's even if you concede that
Trek had coherent rules of time travel up until now, which I maintain that it did not.
Prologic is correct to say that canon, if interpreted on its own, would lead us to believe that the so-called "alternate reality" had in fact overwritten the previous
Trek universe. However, you neglect to realize that nothing in the movie concretely
proves that theory, and nothing in canon
contradicts Orci's many-worlds theory. Therefore, multiple interpretations are possible, and -- just as Aquinas's commentaries on Aristotle's
Metaphysics are considered valuable and weighty in considering differing interpretations of Aristotle's work, despite Aquinas being "non-canon" -- the intent of the screenwriters is valuable and weighty in this discussion, despite being non-canon.
Same goes for deleted scenes, tech manuals, the animated series, and so on. Every guide to canon interpretation, including Memory-Alpha's, recognizes this. They're not canon, but they're useful and weighty pointers. That's why I believe in the Alternate Timeline theory over the Rewritten Timeline theory.
However, at the same time, the creative intent is by no means the final word on the subject. For this reason, I believe a compelling argument can be made that "Eleven is Prime" -- that
Star Trek XI in no way diverges from the original Prime universe history, and in fact
has always been the unseen backstory behind the TOS we all know and love. No alternate or rewritten timelines necessary.
Sure we would. Trek fans can argue for pages on any subject long past the point were the facts support one conclusion or the other.
And that's why I love it here.
It's like Catholicism, only with nothing whatsoever at stake.