Wow. I did not know this.
FMCDH(BITS)
It is hard to find unified statistics. Taking enrollment in DCPS and public charters as the universe, 44% of DC public school students are currently in charters. This, however, still does not include enrollment in private/parochial schools or homeschooled students.
At the high school level, in regular DCPS, School Without Walls, which is academically selective and highly sought after, is generally regarded as excellent. Wilson, in upper Northwest, is not at Walls' level but has made great strides and has a majority of the melanin deprived students in DCPS. Together, per the DCPS website, Wilson and Walls have a combined 460 white students, which is 88% of the total given in the article. Most of the remainder are at Duke Ellington, which is a magnet school for the arts.
That said, if you include charters, private schools, and homeschoolers, DCPS probably has less than a 50% market share of all DC students. As you probably suspect, the melanin deprived cohort is mostly in private schools or charters.