Nope, the movie takes place in Utqiagvik (formerly known as Barrow), Alaska, which is one of the northernmost populated areas on earth. From the Wikipedia page:

When the sun sets on November 18, it stays below the horizon until January 23, resulting in a polar night that lasts about 66 days.[37] When the polar night starts, about 6 hours of civil twilight occur, with the amount decreasing each day during the first half of the polar night. On the winter solstice (around December 21 or December 22), civil twilight in Utqiagvik lasts a mere 3 hours.[34][38] After this, the amount of civil twilight increases each day to around 6 hours at the end of the polar night.

Edit: to OP’s point, most depictions of the Arctic aren’t that far north. 30 Days of Night happens to be one that really does have that level of continual darkness. Even so, while it’s night for several months, it’s really just the day shortening to the point that you don’t see the sun with that civil twilight reducing to a few hours, and then as the “days” get longer eventually you start to see the sun again. The reverse happens for the summer, where eventually the sun doesn’t set enough to be out of view.

You can override the icon anyway. Instead of using the X app, I have a Firefox shortcut for x.com but it’s called Twitter and has the bird app icon instead of a big X.

Is there a reason it needs to be an app? I was in a similar situation and what worked best for me was just replacing the YouTube app with a Firefox shortcut to YouTube.com. I’m still logged in and the uBlock Origin extension strips the ads out. I think the Sponsorblock extension should also work with this system.

In general I’ve just started replacing apps with annoying ads with either a Firefox webapp or a Firefox shortcut. Works great and reduces the app count on my phone too.