Earlier quoted context omitted.
Yes, and the 4,000 received rejections. It was a big boolean fuckup.
Cornell University did a similar thing one year, needless to say, they did not resolve it the same way.
http://time.com/3637980/college-admissions-mistakes-johnshop...
It actually happens dozens of times per year on a one-off basis, usually with college coaches telling recruits they've been accepted when the admissions office has only provisionally accepted them.