I've saw the post in the context of homelessness that is discussed in the article. I also don't share his woldview maybe I understood it in a wrong way but "The world simply doesn't need many of the people born into it." came across as justification for letting these people living miserable lives and deny them basic rights, like shelter and health care.

The problem with such thinking is that it's often not up to us to decide if we are needed in this world or not. And it is also more often than not up to us if we have the energy and power to earn a wage that allows us sustaining our existence.

My impression is that there is a general consensus that every human beeing has some basic rights (U.N. Declaration of Human Rights) and that we as a society should work to provide these rights for everyone even if we have to sacrify some personal profit for it. Because it can also happen to us.

Op's post came across as If he does not share this views. I'd say if you deny basic human rights I can call you barbaric.

There is a difference between saying it's not a good idea to get children if you are in a bad economic situation or saying that it's correct that these children suffer homelessness because their parents made a bad decision or are somehow not fit enough to procreate. If you start to talk about fitness (here indirectly measured as ability to earn money) as an indication who should procreate you have a form of social darwinism. And there are a lot of problems with such a thinking.