Running over a piece of debris so large that it feels like it lifted the car absolutely means "pull over immediately". He had no idea what structural damage occurred to the car, and continuing as is put not only himself but other drivers on the roadway in danger.
There is negligible danger pulling over on the freeway. I can only imagine that he didn't want the inconvenience, which is remarkably selfish.
Since I have no hard evidence either way, I have to go with my gut, which says that pulling over on a freeway shoulder is dangerous and should only be done as a last resort. But I would welcome evidence to the contrary.
I find your reply simply incredible given that in this case the driver not only didn't pull over on a significant impact event, they stayed in the left lane, then causing a huge road hazard as their car burst into flames, forcing them to pull off the left shoulder of the highway (again, the most dangerous place to be). To bizarrely question my advice seems rather foolhardy given the situation that we know.
Condescending blather about what we're "here for" is not what we're here for given that we're discussing the details of this event.
There is negligible danger pulling over on the freeway. I can only imagine that he didn't want the inconvenience, which is remarkably selfish.
That aspect of the story read very poorly.