I didn't assume that.
It's bright from other background lighting as it climbs, and about the same descending. There's a much brighter flicker, but this could be a forward facing landing light lining up with the camera for an instant. Think of a lighthouse on the coast, and watch again.
The camera footage is in night mode (infrared).
That's not easy to watch, something catastrophic happened out of frame, unlikely anyone would have survived that impact.