Then, pray tell, which lack of "being an outlier in some socially/politically relevant cluster" is common to Asian applicants, year after year? I'm sure we would all be fascinated to hear the specific areas in which Asian applicants are failing to match these heuristics where other minority applicants do.

But to put a very fine point on it, Asians with stellar scores, similar backgrounds, similar interests, similar extra curriculars lack diversity in backgrounds, interests and extra curriculars by definition. There's nothing deeper to be noted about this. Whether Asians that apply to Harvard actually have similar backgrounds, interests and extra curriculars is certainly up for debate. But it is plausible.

The issue is that the distribution of leadership potential in the applicant pool is not equivalent to the distribution of top GPA and test scores (past a certain threshold). So when you use your GPA/SAT metric to analyze something that doesn't follow the same distribution, you will conclude there is bias. But it is your metric that is wrong. If your argument is that they necessarily should use your GPA/SAT metric, then you have to argue for this directly. It is not self evident.