If you know that the general population is 20% race A, 10% race B, 30% race C, and yet your admissions are only pulling in 40% race C, 5% race B and 55% race A, you know something is wrong. Policies designed to keep your admissions closer to the general population would not count as discrimination because if everything is functioning correctly your distribution is going to at least resemble the gen pop distribution. Obviously it will never be a perfect fit, because various factors like location, education etc will influence your hiring pool.
A lot of people insist that trying to get your metrics to match reality is discrimination because they think it means someone who "doesn't deserve it" will get hired instead of them. The reality is that a biased pipeline might exclude you too, regardless of your gender or skin color, because a biased pipeline is probably filled with things like nepotism, people blackballing candidates off of Vibes(tm), hiring based on appearance, etc. For every time biased hiring benefits you, it probably hurt you 3 times and you might not have noticed.
The reality is that if you look at the raw DEI metrics for most large corporations they do not even vaguely resemble the general population. There's no rational excuse for that, you have to do something.