I like your reading. It might somehow even be true. They were smart to use older Spock instead of older Kirk. However, this "alternate universe" that older Spock is dumped into is somehow a lot louder, dumber, and coarser than the one he came from. He even gets wrong the chronology of the Enterprise. He is surprised to learn that Kirk isn't the captain, but only because he's going off his own timeline. However, back in his timeline, the Enterprise would have been under the command of either Robert April or Christopher Pike. Spock even served under the latter. Given this error, and the fact he doesn't think to warn the Federation of Nero's upcoming attack, despite knowing of an outpost nearby, I think a fan could be forgiven for looking upon Spock's remarks to Kirk as the ravings of a senile crank.