Actually, in specific reference to turns in anarchy, I think that this refers to something a little different. Say you revolt and get 8 turns until you can reestablish a government. While still in anarchy, you revolt yet again (not having previously saved the game and re-loaded it), and this time, you get 6 turns until you reestablish a government. This is only useful for the longer periods of anarchy (i.e. 7+ turns), because the chances are still pretty high that you can get a lower period of anarchy.
And then of course, there is the other kind of re-rolling in which preserve random seed is turned off and you just keep reloading a save until what you want to happen happens.