If we assume Nero arrived in the past of his own reality and created a completely distinct universe starting from 2233, then the question becomes: how did OldSpock cross over to that one, rather than arriving in the past of the same reality he left from?
Because he went through the same anomaly, and that's apparently how Red Matter Black Holes work.
Space Therapist said:Spock Prime and Nero are constantly being referred to as being "from the future" either by themselves or by other characters within the movie.
That isn't an argument for so-called "linear time". It's just how a character in that position would refer to the situation. Time travel to the past can be expected to produce some changes which would ensure that the future will be at least slightly different, so it's not 100% precise wording in any case ( unless interpreted to mean that Spock Prime is actually from the Abramsverse future, which would be a loop ).
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