[SPOILERS] No one seems to be talking about that OTHER huge event

[Lium]

(For this timeline alone, Future-G'raha traveling to the past did not change the state of the time he originated from. That's what I meant by calling the bad future a stable time loop.)

So, basically you're talking about the Kelvin timeline in Star Trek or what Avengers: Endgame did.

Changing the events of the past do not necessarily change the future. They just create alternate timelines. In that regard, it's quite possible the bad future still happened and that timeline is unchanged. But because we stopped the Calamity, we are all now living in an alternate timeline.