No, but it provides insight into the assumptions that the screenwriters had in place while writing the movie, which means that the movie will be based upon those assumptions whether implicitly or explicitly.
Exactly. Pegg's statement means that, from now on, the people making the films won't hesitate to contradict anything pre-2233 in Prime, or to portray aspects of the universe in ways irreconcilable with Prime. They could, say, completely redesign the Borg as nonhumanoid CGI monsters, or replace Chekov with a version of Saavik played by a black actress, or do whatever they feel like without being restricted by what the previous incarnation did.
The thing is, I don't think Pegg's model fits with canon information (regardless of whether it's the franchise on a whole, or even just the Kelvin timeline films). So, I have a hard time giving it any credence from square one.
You're getting the cause and effect of canon backward. Canon is not some pre-existing reality that imposes limits on what storytellers are able to do. Canon is just the set of stories invented by the creators of the franchise, or their officially chosen successors. And what those creators say
becomes the canon.
The only thing this really means, as I said, is that the filmmakers are now embracing the fact that they're creating a new version of
Star Trek and can do whatever they want with it. Which is obviously the smart approach to take if you're reinventing a franchise with an alternate continuity. Now they'll be free of the baggage of 50 years of Prime continuity and have no restrictions on their own creativity. It's what they should've done all along, but the "Supreme Court" members were worried about alienating the fans and so they offered the pretense that this was just a branched-off variant of the universe we knew, resulting in a betwixt-and-between continuity that hobbled them and just raised more fan objections when things didn't fit. Now the new creative team (minus Lindelof, Kurtzman, and Orci, plus Pegg, Lin, and Jung) has committed wholly to being separate and new, and that is so clearly the superior choice from a creative standpoint that I can't believe they'd ever go back to the old model.
Also, I seriously doubt that they worked this up beforehand. I'm suspicious that they developed it after the fact to justify them changing whatever they want about the franchise
Yes, obviously. That's what they were hired to do in the first place -- to change the franchise, to make it new for a new audience. Now they're finally free to do that without restraint.
so that they have a blanket defense when the mistakes are pointed out.
Ohh, you were so close, and then you lost it. They aren't "mistakes." They're alternative approaches to a fictional construct. It wasn't a mistake for Frank Miller's Batman to be darker than the one Adam West played. It wasn't a mistake for Sam Raimi's Spider-Man to date Mary Jane Watson before he met Gwen Stacy. It wasn't a mistake for
Elementary to make Watson a Chinese-American woman. These were reinventions. The Kelvin Timeline is, and has always been, a reinvention of
Star Trek. It tried to pretend to be a continuation while still reinterpreting things, and fans just complained about the bits that didn't fit. Now we can just accept it as the independent construct it always should've been.
(To be fair, the idea on paper has kind of grown on me, but as presented, I feel that they theory doesn't work, and, for all practical purposes, is a smokescreen for the shaky foundation and internal problems that this movie series has had from day one.)
I couldn't care less how it's presented. The technobabble Pegg offered to explain the decision is beside the point. What matters is the decision itself, the choice of the filmmakers to give themselves
carte blanche to make changes rather than arbitrarily limiting themselves. That's good for future filmmakers because it lets them focus on telling new stories, and it's good for us novelists because we don't have to panic if a new movie contradicts something about pre-2233 Trek history. I see nothing here to complain about -- nothing that actually matters, anyway.