So it's set in the timeline that ceases to exist an the end of 'Unending'? No that can't be it, because the team is onboard the Odyssey the entire time, as it is trapped in time and space....
Okay, um, that timeline ceased to exist, along with the people in it (except Teal'c), so how can there be an effect on the post-Unending Odyssey? I think there might be a physics/time issue here.