No, the end of X-Men: Dark Phoenix DOESN'T contradict Days of Future Past. 1 / 7
In X-Men: Days of Future Past, Wolverine experienced an idyllic future timeline... 2 / 7
Where Charles Xavier was headmaster of Xavier's School, and old friends like Jean Grey were still alive. 3 / 7
How does this fit with Dark Phoenix, where Jean apparently died and Xavier retired? 4 / 7
Fortunately, the very end of Dark Phoenix stresses that Jean isn't truly gone, and could return... 5 / 7
And as for Xavier, a lot can happen in a 30-year period - there's no reason he couldn't return. 6 / 7
There's no reason the timeline couldn't match up perfectly. 7 / 7