Okay, fine. What you said is different than what Reelya said but it is both similar to and worse than what Reelya said. What Reelya said (as in, his negative example of not-breeding = less poverty) was coming from an altruistic perspective. It was saying, "I know I'm telling you not to breed and that's rude, but I'm at least benevolent. I'm at least trying to help."
What you're saying is coming from a perspective of judgement. Its saying "I know I'm telling you not to breed, I'm not going to acknowledge that that's rude, and to top it all off I'm going to blame you for a future thing that is not certain to happen."
Malthusianism is basically discredited. He was speaking at a time of early industrialism and urbanization, expressing the fearful undercurrent that existed in an agricultural society that was losing its aristocrats. Basically Tolkien without the pretensions of fantasy. Or to put it more concretely, he wasn't looking at the modern world and saying that the exponential growth of the unwashed masses would lead to environmental collapse. He was looking at places like Age of Sail/Victorian era London or NYC and saying that the growing population of urban poor would lead to starvation. This didn't happen. He wasn't talking about places like Syria, Nigeria, or Alabama that are stereotypical hellholes in the modern day. He was talking about the urban centers of places like the US, the UK, France, ect. Notice that those places are not starving hellholes, but rather some of the most food secure places in the world (putting aside people who don't have money to buy food because regardless the SUPPLY is there.)
Additionally, to believe that overpopulation will lead to ecological collapse is to specifically go against the consensus of modern anthropologists and sociologists, who consistently conclude that when people feel secure and prosperous they have less children and when people feel insecure or poor they have more kids. When rich people wait to have kids, that's not them being enlightened and rational. Nor is it them doing their duty. That's them doing what humans do according to human nature, same as poor people are. What's causing the modern day ecological collapse? Cars, coal, and cigarettes. These things have no particular connection to poor people. Or rich people, or urban people, or rural people. They're technological problems with technological solutions; its not about population numbers. If it were, the greenhouse gas emissions of each country should closely relate to its population. But that's not what happens.
Saying that someone has a duty to do something is different from saying they should be forced to do it, but its still a step in the same direction. Like when I say that out of touch old people shouldn't vote, I'm aware that's a rude thing to say. If I wasn't emotionally angry at an entire generation, I wouldn't say things like that. Its like how when people say things like "I'm such a nice guy, women owe me sex" or "you should kill yourself" or "uninstall plz" those are considered impolite sentiments. Cause you're pressuring someone into doing something that is not your decision to make and/or is not in their interests. And is also an implied insult.