It means that a lot happened in 10 years, so when comparing a single event to the whole thing, obviously it can only match up to part of it, not the whole thing.
That's still silly as that would imply that the US is currently in the middle of a 10 year cultural revolution, yet there's no slew of dead educated people. So again, this is a poor comparison. Do you really think China's cultural revolution put people through a rule of law court system and acquitted people? Or do you think that they just went around murdering people on drumhead trials with no rule of law? (Hint, it's the latter)