Okay, so if they admitted the same 3,905 students as last year (see link in post #1) but received 13,400 applications, the acceptance rate would be 29% for the class of 2020. If they only admitted 25.5% of the 13,400 applicants, that would only be 3,417 students, which is 488 fewer admits than last year.
That 488 fewer admits than last year suggests to me that either they admitted a higher number of students via ED1 and ED2, or they overenrolled last year and decided to extend fewer offers and then take more students from the wait list (it is also possible that both of these are true).