This whole idea is completely wrong, in my opinion. You first need to demonstrate why your sampling model/methodology (collection of top50 NA CS departments) will lead to an error-free way to establish a discrimination type mechanism of selection. There is a near absence of people of South east asian origin in the NFL, but I don't think the NFL is doing so on discriminatory grounds. The end result is under-representation, but the underlying mechanism is not one of malicious discrimination by the talent scouts.

The point is, lets discuss evidence of discrimination rather than a weird "this can only be possible with discrimination" argument.