Spock says "If" twice.Uh, I think it's pretty explicit (emphasis added):
The supposition turned out to be correct because later Trek just said it was so. (And somehow in Star Trek '09 it was a known fact beforehand.)
This is kinda like when Kirk made a guess about having to de-cloak to fire in STIII, and then Trek went on to act like that was just the rule always and forever.
