North vs South Korea would be an example of nurture/environment, not nature/genes.

An example of Nature would be comparing well fed children of basket ball players vs children of horse jockeys.

I suspect that was a mistype based on their other post, it was probably meant to be "nurture"?

Yep, nurture definitely. Can’t edit it anymore.

Nature can still be important for even highly heritable traits. For example, the size of a person's vocabulary is highly heritable, but a feral human will have very limited vocabulary. Such traits still have a very strong biological basis.