At highly selective colleges with open major enrollment, CS is usually either the most popular major or 2nd most popular major. In the 2023 graduation year, CS was 2nd most popular at Harvard, after econ. However, this CS popularity is a relatively recent change. Back when the lawsuit sample occurred, CS was a far less popular major at Harvard than Psychology. In early years of the sample, CS was a less popular than English. At the time of lawsuit sample, the most popular majors at Harvard all fell under the social sciences grouping, which was the major grouping with the highest personal ratings regression coefficients.
I suspect the different average personal ratings by intended major has more to do with self selection. Students who favor majors/careers that emphasize studying people or interacting with people on average rate higher in measures correlated with interactions with people. Students who favor majors/careers that emphasize calculations with numbers or code over people are more likely to rate lower on such dimensions. Note that these are relatively small differences in the overall average, and there are many exceptions to these generalizations.