There's a cottage industry that creates fake lightning strike videos. They're usually grainy to cover up the fakery.
Lightning strikes are relatively easy to put into a video. Getting the reflections right is harder though.
I'm not an expert, but the reflections don't look quite right to me. More light in the reflection than there should be in places where we don't see a reflection of the people before the lightning strike.
That's true, though lighting strikes kinda-sorta create their own path of least resistance. They're complicated, and I still consider it slightly unlucky given the proximity of the building.