You specifically left out the “a science” part, which is also part of the “kids’” definition for eugenics in your source.

eugenics noun eu·​gen·​ics yu̇-ˈjen-iks : a science that deals with the improvement of inherited qualities of a race or breed and especially of human beings

Removing the “a” from the beginning completely changes the meaning of the word, which is why you did it.

Shame.