As they should be.
That’s an interesting video and I don’t doubt it shows the lights going behind the Estrella Mountains, but the lights were seen at distances of a hundred miles or more from there that night.
My cousin, who is a PhD engineering professor, saw them directly overhead at Cordes Junction. This is a good sixty miles from the mountain range in the video. He also saw the stars in between the lights obscured by an exceptionally large triangular black aircraft.
He is the very picture of rational skepticism, and dismisses both the “flare” theory and the notion of alien visitation as 100% bunk. He suspects it is some sort of classified military project, or perhaps a very elaborate prank pulled off by a super-rich nerd like Steve Wozniak or Paul Allen, and I also agree that this would be far more likely than a ship full of little green men from another galaxy.