After the SCEA round, each alumni chapter is notified of which students have been admitted. It’s the same with the RD round. The alumni chapter then passes that information on interviewers, who sometimes send congratulatory emails to the admitted students they interviewed. So your interviewer already knows you were not admitted in the SCEA round, and unfortunately there is nothing more they can do for you. No, they are not going to contact Admissions and put another “good word” in for you, as that is not how the admissions process works (sorry). And yes, contacting your interviewer and asking them to put another “good word” in for you will come off as desperation. I’m sure your interview report was outstanding, however please read this article from a Harvard Alumni Interviewer to understand one person’s perspective on the process. Your interviewer has absolutely no control or say over which student’s Admissions takes: https://www.nytimes.com/2007/04/29/nyregion/nyregionspecial2/29Rparenting.html