It'd be neat if you actually read basic lore on a character before you make comments. https://wowpedia.fandom.com/wiki/Kai...ld_of_WarcraftKairoz specifically had no power over the timeline without the Timeless Isle.
He needed the Sands of Time from there to craft the Hourglass of Eternity, which is how he managed to time travel without powers. He then used said Hourglass along with the Dark Portal to stabilize a portal to another time, which made the WoD timeline possible to maintain alongside the main timeline. So Kairoz and I have had words, but he needs to remind you how his situation worked.
And yes, Nozdormu was shown the moment of his death. We know he expects to die that way. What we don't know is, if Nozdormu taking the Dragon Soul from the past, changed the future. We PRESUME Nozdormu will still go down that path because that's the future he was shown - But if the future changed, due to him having changed the past, we would have no way to know if his ultimate fate changed unless Aman'thul shows him his fate after every alternation. (We know he doesn't.) Even HE wouldn't have any power to know that, because he wouldn't know he was going to mess with the past prior to becoming Murozond, or he'd have to stop himself too and ultimately cause the End Time to occur.
That's why it's wibly wobly timey wimey shit. Because you can't change the past, while simultaneously, not changing the future.