Not Spock specifically, I mean Prime Trek generally was already on the change. If the existence of a DY100 model on a desk is enough to make something an alternate universe, the differences between the early episodes of TOS indicate either multiple universes at play, or we accept that the Prime timeline has always been modified.Spock's ancestry? I don't really see any conflict between "Where No Man..." and "Corbomite"? He just wasn't as forthcoming about who his human ancestor was.