Senior in the sense of being of older age or serving longer? I’m trying to get what’s supposed to be non intuitive here, other than the obviously P.C. slap on the wrist that she got.
Btw, I'm just assuming that with 16 years of service, he was an E7. It doesn't say what his original rank was, just that he was demoted to E5 so it's possible that he was an E6 and not a senior NCO.