So two things.
One, those rates are misleading. For applicants who've checked off the normal boxes (high GPA, high SAT, rigorous high school load, reasonable ECs, etc), the acceptance rate to these schools is upwards of 50%. The odds of getting into at least one top 20 school is likely bordering on 99%, especially for applicants who are applying early decision to their top school. Wash U has a 25% admission rate for early decision applicants, similar to other schools which prioritize ED applicants. I have many, many friends from high school (public, nothing fancy) who got into all those schools and similar without going crazy. And yes, I know that college has gotten more competitive since then but I have plenty of family friends who've applied and gotten into similar colleges more recently and again, they're not doing anything exceptional. Take plenty of AP classes, get A's in them, score high on your ACT/SAT, excel in 2-3 extracurriculars, and make sure to do some type of volunteering-like activity.
The second thing is, what makes you think the consultant actually made a meaningful impact on college admission for those kids? The assumption you're making is that these kids would not have gotten into those colleges without the consultant. I don't find that plausible, especially for kids who are obviously coming from backgrounds where they're undoubtedly getting tutoring, test prep, etc.
Not even getting into whether, outside of the top 5-6 colleges, going to a top 20 college is worth it (you can see my previous posts on the topic).