Congratulations. You possess exactly the lack of irony necessary to have just proved his point for him.
What if I told you there are more ways of looking at the world than market-capitalist terms? That some people value things on whole different axes than what will and will not make them more money?
He also said in the article: "Medium has become overloaded with loud, obnoxious idiots and I am no longer comfortable telling people, ‘Yeah I post on Medium, check me out.’"
To me, this sounds like he is concerned about his personal brand / reputation, which he aggregates with the content of Medium as a whole. As such, I think that lucasnemeth's points are reasonable.
Some people just want to create and show it to the world, they are not obsessed in getting millionary over it. But that goes against the "entrepreneurial" culture installed over the last decade where everyone thinks it's a nice thing to actually pass all your time promoting yourself like you are some kind of brand.
From what I got from the article, that's exactly what the author of the article is against.
But to a capitalist market a mother's love of her child is of huge value. Because that child is immediately a part of that market due to the money the mother spends to raise the child. Then the child eventually grows up to enter the market as a consumer to spend money on herself or maybe enter as a producer. Eventually she may have a child of her own to repeat the cycle. Without children a capitalist market eventually dies and a mother's love is one way to help its survival.