I personally believe there is no way for them to succeed. If they were acting in good faith the actual incease in the number of intelligent people, who would recognize cruelty when they see it, would tear it down. If they acted in bad faith, which they most definitely would, they would fill the world with these idiots.
Well, it’s a shame for you that the definitions for words don’t care about your feelings.
Do any surface level research on eugenics and it’s always first and foremost about things like forced sterilization/select so called “superior” people for breeding and the like. Even when nazi Germany is mentioned the focus is on forced sterilization and support for the families considered “superior” over those that aren’t.
The ethnic cleansing done in nazi Germany, while used in tandem with eugenics, is its own seperate thing.