It's pretty clearly pieces of solar panel tumbling and catching sunlight as they fall. China would not risk of flying explosives over the continental US given

It's pretty clearly pieces of solar panel tumbling and catching sunlight as they fall. China would not risk of flying explosives over the continental US given the US was "balloon bombed" by Japan during WW2. If the thing crashed in some farmer's field and then blew up when he went to poke it with a stick, it wouldn't start WW3, but would result in huge domestic political pressure to "do something". Even just video of the thing blowing up mid-air would be horrendous optics. "They were flying something really dangerous over us!"