It is from the reality where Nero and Old Spock come from, which is the one we saw up until 2009...
Nero traveling back in time and destroying the Kelvin changed almost everything, so it is an alternate reality...
The ships are more advanced, different alien species are part of the Federation, Kirk lost his father, Spock his mother and his planet, Spock and Uhura are in a relationship...
Just to name a couple of major differences from the original timeline/reality...
So Sulu being gay in this reality is not that big of a deal...
Whatever you want to call it, doesn't make it another universe. Blowing up a planet does not change someones sexuality. It's like saying "bringing the whale back made Kirk homosexual"