I agree. Eugenics is about harming the rights of the would-be parents. It means telling them, "You have traits we consider undesirable, so we will forcibly prevent you from having any child whatsoever."

To me, that's different from parents choosing to avoid having a child with certain traits. Or not having children at all.

If parents decide to cure a disorder in their future child, or decide to abort a pregnancy, nobody is stopping those parents from trying again. The parents themselves have not been deemed undesirable and unworthy to pass on their genes.