I didn't stigmatize poor people. If you consider stating facts of reality to be stigmatization, you are fighting reality, and that is no way to deal with it.
> rather than focusing on bad luck they have had
One of the main point of the article is precisely that being poor is not bad luck: overall, it happens because a person didn't take education seriously because they were not taught to do so by their parents.
I mean, you can say it's bad luck to be born to such parents, and I would agree there.
Certainly free and easy access to sex education, contraception and abortion is something that is a good policy.
People, even poor people, have always, and will always want children.
Once children are born to poor parents, you need to address that poverty, or you will get poor educational outcomes for those children.
Certainly stigmatizing poor people, rather than focusing on bad luck they have had, will provoke different policy outcomes.