The comment I was replying to said that people aren't having kids because they are morally against the concept of (anyone) having kids. The article is about people who perhaps want to have kids but their job pays too little and takes up too much time. Those are about as different as reasons can be.

Another top-level comment included a link that lets you read the whole article (though there's not much substance to it, and the distinction was already clear about by the end of the first paragraph). There isn't much discussion about it because that's discouraged on Hacker News. From the FAQ, under "Are paywalls ok?":

> In comments, it's ok to ask how to read an article and to help other users do so. But please don't post complaints about paywalls. Those are off topic.