"Under the new rules, Fairfax will first identify all eighth-graders who meet certain academic criteria: those who achieve an unweighted GPA of at least 3.5 while taking Algebra I or a higher-level math class, in addition to math and science honors courses and either an English or social studies honors course."
"In a bid to ensure geographical diversity, a certain number of seats will be allotted to every middle school in Fairfax County, to be filled by eighth-graders at that school who meet criteria."
Doesn't seem very meritocratic to me. Doing a lottery among everyone with a 3.5 is basically saying select every student that isn't failing. High school GPAs are highly inflated to the point that most people who would be competitive in the current application system have above a 3.9. The geographical diversity quota is de facto a race quota due to redlining and cultural enclaves. I don't know how you can possibly argue that accepting students from all over the district objectively through merit is worse than a geographic quota per middle school.
And what happens when you diversity admit these students who, by the admissions test, are not as competitive? The vast array of clubs and other high school competitions become dominated by the most competitive students, i.e. they're going to look like what TJ looks like now: 70% Asian according to the article. In effect you're tossing unprepared students into the deep end to get screwed for the college application process because they have 0 chance at securing any sort of extracurricular activity for themselves.
The real kicker here is that by the article's quoted data, 70% of the school is Asian. If you really wanted racial diversity in line with the population you'd also be pushing for increased white representation along the lines of a 150% increase in # of white students admitted. But that's not what these activists are talking about, which is how you know their ideas are just politically motivated garbage.