It's not that it happened or not. Obviously the star trek universe is all a fiction made by a studio for profit, but it's a universe we enjoy "living" in. I don't know about others but I enjoy when a author/series creates a (sufficiently) believable universe where you know the rules, the history, the notable figures. Off the top of my head I'm talking the star trek universe, star wars universe, Larry Niven's Known Space, Middle Earth. Fictional worlds that are described enough that you can be in them with enough suspension of disbelief. But with this new film all of that for the star trek universe is kinda thrown away. 40 years of tv shows and novels and video games, all that story and detail, never happened now, at least in-universe. I've heard it mentioned that they may maintain both timelines/universes, but that is not guaranteed. This was my biggest gripe about the movie, that and it's a pure action movie, not trek yet. I tentatively liked it and will wait for how it all plays out next.