So Few Schools With >75% Yield - Lots OF People Reject Ivies?

All previous yields I’ve listed in this thread from 2017-18 IPEDS, which lists the following, All 4 colleges I listed had yields of 57% +/- 2% in this federal database.

Yield for 2017-18 as Reported in Federal IPEDS Database
Brown – 59%
Dartmouth – 58%
Cornell – 56%
Notre Dame – 55%

If I switch to a source of official university publications for the class of 2022, then I get the following yields. With this source, all 4 colleges I listed appear to have yields of 60% +/- 1%. Either way, the yields at these 4 colleges are similar, which was my point.

Yield for Class of 2022, as Reported by the Listed University
Brown – 61% (see http://www.browndailyherald.com/2018/10/12/university-yield-rate-hits-time-high-61-percent/ )
Dartmouth – 61%
Cornell – 61%
Notre Dame – “Nearly 60%”