If I remember correctly, those numbers are pretty accurate for whatever year those numbers got released cause they're statistics that are reported to USNEWS from the schools and also takes into account people who withdraw. That acceptance rate is post-waitlist too, not just right after interviews.
A lot of people deny their interview invites (don't go to interviews) and a lot of people withdraw while on the waitlist. Wayne is also a big class that essentially accepts 2x the number of spots. If I were to guess, it's like 50% get accepted after interview and 50% of waitlist people get accepted, so that makes it hover at 70-75%.