Lets go with your 3500 number. In 2006, 976 blacks scored above 700 in SAT math, and 1117 scored above 700 in SAT verbal.
1117 is a lot smaller than 3500. (Or the 3000 number the study uses.)
(Note: 1400 SAT, or whatever that translates to on the current 2400 pt test, is table stakes for getting into a top 25 school.)
I don't know why you put "study" in quotes - do you consider the Journal of Blacks in Higher Education to somehow be an "illegitimate" source?
To imply the admissions officers are giving minorities a whopping 80% preference to minorities, based of the data, shows that admissions officers are either incredibly incompetent at giving preferential treatment to minorities, or you are just talking out of your ass.
I don't understand. If you take 1200 qualified black students and turn them into 3000 enrollees, how is that not a highly successful preferential treatment program?
Similarly, the relevant comparison when looking at Asians is not what percentage of the American population they make up. A more relevant comparison would be what percentage of the top students are Asian. I can't find top scores, but a quick google search suggests Asians do in fact outperform everyone else on average.
https://nces.ed.gov/fastfacts/display.asp?id=171