Yeah it looks substantially more egregious in that guy's review than in promotional pictures, but knowing NECA's quality control standards some will have issues and some will not, luckily the separation between the dome and top of the mouth's something easily fixed with a bit of Vallejo water texture acrylic.
I did the same for their Alien Covenant figures in the past.
I'm fully aware you should not have to, especially for the price point here, but I'm just glad it's the one thing instead of multiple issues in the sculpt itself and the other stuff I have previously listed.
Here's photos for comparison:
My repaint and mouth overbite fix:
The original (with overbite) promotional photos: