i don't see this as something bad, quite the opposite in fact. it's true that the technology is just not there yet, but with some time, and the help from psychologist and other experts we could see a future in which the grieving process could be shortened or helped with these methods.
absolutely no one grieves the loss of a child like a mother, and if there are ways to help them and make them cope then let them enjoy the company of their child one last time, many parents in similar situations would do anything for a moment like this.
the only unethical thing about this is the public nature of the moment, i don't know about this show specifically, but documentaries and shows like this profit from strong emotions and controversies, they try to exploit and milk people for their own benefit. and i have a general idea of how cutthroat and predatory the entertainment industry is in south korea. maybe by some miracle they have the absolute best intentions in mind, but this kind of stuff is something that should be done in private and only shown to loved ones if we are going to pretend that this has any therapeutically use, but at the same time all technologies need early adopters and they need to show their reaction and feelings in a public way for others to judge if this is a good idea or something that they could be interested in, so i'm really thorn about what to feel about the show.