Progressives know genetics matter, e.g. there are essentially zero people with downs in Denmark because laws stipulate that you must genetically test the unborn. Those few that make it through this eugenics program are the result of false negatives.
Denmark doesn't have a testing requirement, nor are people only born with downs if a test failed. (It does have very high testing rates and corresponding high rate of subsequent abortions though)
Universal screening had unintended eugenic consequences. That scientific fact isn’t controversial, what is controversial is to say whether it was good or bad.