This is so interesting. Because there was definitely a sunset in the same place because of the jittery refracted lens flare you get on small lenses with image stabilisation showing a bright sun was indeed there.
But there appears to be rotoscoping on the foreground, especially visible on the edges of the snow on the roof.
But there is definitely a beautiful sunset casting orange glow on the landscape.
So it looks like they took a picture of the same sunset separately and composited it to the background to effectively increase the dynamic range.
Am I right?