Yes, and to provide the numbers:
In William’s class of 2029, ED acceptance rate was 26.6%. It’s RD acceptance rate was 7.3%. Their target class size was 560, and they accepted 257 of these ED, so they accepted what they anticipated would be 46% of their incoming class ED.
Middlebury’s target class for 2029/2029.5 is 755 students and they accepted 519 ED1 and ED2, though this includes 30 Posse Scholars, an unknown number of QB students and College Track students. So at least 67% of the incoming class who are not being admitted through the various programs programs come from ED1 and ED2 applications.
That is not accurate. Even after taking into consideration athletes and such, admission rates for non-hooked individuals during ED are still around >2X the RD acceptance rates.
Many colleges make this same claim, but none have ever released data that would support this claim. I believe that it’s to make sure that the ED applicants are at least mostly kids only ED to their top choice, rather than apply to that college ED because it’s the college with the lowest acceptance rate on their college list.