Breastfeeding isn't natural????

So I came across this discussion about a woman that explained her experience trying to BF her twins. She stated that it was "Not natural" for her. I understood it as it was difficult and took some work in order to be successful at it. However, this woman says it's NOT natural and that we do it because we've observed this behavior. So I'm curious how others feel. I tried clarifying by explaining a mother may have to learn how to how to get her baby to latch but the act of breastfeeding was still natural whether she's able to do it or not. She still disagrees. 
This is her explaination