Using stop motion, you can see a brief flash from the shiny brake rotor as the wheel tumbles at the end of the clip. It’s hub must have gave up where it bolts on to the suspension. Losing lugnuts wouldn’t kept the rotor with the wheel.
From my trucking years I’ve seen a several failures from this idiot ‘it will be just fine’ mentality.
How does the rotor come off without the brake caliper also coming off?