Bullshit. It's literally impossible to say "some people should not have children" without making it a moral judgment. You're just gaslighting everyone by pretending your morality is objective. You're literally pulling an Ayn Rand.

Pick the worst case you can think of, the kind of person who is unlikely to be able to support children. Imagine a profoundly disabled person, themselves a ward of the state. You would like to pretend that objectively, they shouldn't have kids. But a hell of a lot of disability advocates would disagree with you. They would argue that anyone who wants should to should be able to have kids. And if they can't support them, well that is why we have welfare programs.

"Should" is by necessity a moral statement. You're literally saying how you think the world should be and how people should act. That's the literal fucking definition of morality!