When you subtract legacy students, athletic recruits, and underrepresented populations, the actual admission rate for ordinary students is much lower than commonly stated. The actual rate isn’t known because colleges don’t want to disclose this kind of information but students applying to highly selective colleges need to be aware of this.
Does this mean you shouldn’t apply? Of course not. But when applying to a highly selective college make sure that you also have some less selective colleges you are applying to.