If I'd had the chance to speak with them, I would have told them the truth [about inter-Korean history] and warned them that they could eventually face punishment from the North Korean regime, simply because they had already experienced life in the South" says Mr Lee
Given the rest of the article, it seems that the current SK president is trying to play nice with NK and isn't exposing these drifters to historical facts. I still doubt they and their families will have a good time back home.
You should watch the documentary "Under the Sun". North Korea agreed to let the director film with the understanding he would follow their directions, almost to the point of following a script. However he secretly kept filming. It's pretty fascinating. https://imdb.com/title/tt5129818/
Probably not, they'll be watched for the rest of their lives but might also live pretty well, they'll be paraded around as examples of why leaving isn't even worth it, these people tasted the outside and 'came back to beautiful best korea'