The point is they should have known. They obviously somehow figured this out during the interview. They probably already knew.
And the admissions department sole reason for being there is to keep all files orderly and make sure students meet their requirements so they can be interviewed and subsequently accepted or denied.
This is like saying they don't accept people under a 3.25 gpa. Yet they invite him for the interview and after the interview they say; sorry we don't accept people w/ a 3.15. Sorry.
Thank you!