If paralysis and other major forms of disability were curable, and if aging could be both halted as well as reversed, would anti-natalism disappear?
Most of the potential cause sof suffering they cite are health related.
Sure, there's also stuff like poverty, but that can be tackled through UBI and automation.
It really seems like the biggest justification for anti-natalism is our bodies' frailness and medicine (right now) being incapable to do much about it.