Kim Jong-nam is the father of Kim Han Sol and he's long been a critic of North Korean regime. He still lives with massive state handout safe and sound.
I'm surprised Kim Jong-nam's been left alone.
Ordinary North Koreans wouldn't hear about this unless the North Korean government allows it to be published, so as long as he doesn't go around doing stuff that cause direct domestic problems for the regime, the only reason they'd have for going after him or his son at this point would be a personal vendetta.
If they were to go back and start walking around Pyongyang criticizing the regime to ordinary people or otherwise engaging stirring up domestic trouble, sure.
I doubt North Korea would show this domestically, but that doesn't mean they would find it unacceptable for export to other countries if it increases sympathy and brings on another round of aid. They have been alternating between provocations and pity for decades now...
And in response to "propaganda comments" on the article, as a Korean American I know that the strongest sentiment in Korea is still towards unification. I've never understood that (and still don't, to some degree) but watching this video gives me a glimpse of that. When I hear this kid speak, I see me. It leaves me unexpectedly hopeful for the future.