Despite my comments about the sky not always being red, I think there is a simpler explanation.
This video was made by a "content" company on a monetized YouTube channel. The screenshot is simply a colorized version of a black and white image
Note that the notes below the video do not provide the source of the images. You can't check the source of their data, they offer it only in the form they want you to see.
from the "Front Obstacle Avoidance Cam B" shown later between about 00:39 and 00:43 in the video.
Edit: The original color analysis I had here is not conclusive as @Ruslan points out so I'll replace it. It's still viewable in the edit history. Instead, while not conclusive I'll compare a cropped bit of Ruslan's suggested PIA19070 with a cropped bit of the (likely) colorized image screenshot from the video.
