It is not an explosion but a sonic boom.
I’m sticking with “fake”:
1. Sonic booms are doubled for things long enough for people to notice the time gap. This had a single boom; 2. No smoke trail where it was moving; 3. Hypersonic missiles described as “almost impossible to track”, which doesn’t appear to apply to a blazing, white hot shooting star-like object, that even a dude on a street can point his smartphone towards and film (allegedly).