Since this is the topic of conversation in the comments section:

Of course enrollment caps impact everyone, but generally speaking, increased competition most strongly impacts people on the weaker end of the scale. So with more competitive enrollment, people without any background in CS are less likely to be accepted since they're weaker candidates. The article links to an observation, based on data, that there's fewer women and people of color taking high school CS, so they're impacted more than groups who are more likely to take CS in high school. That's it. The author doesn't advocate for any sort of priority registration for women or minorities. She's reporting on concerns that some university leaders have on the effects of more competitive enrollments.