Thank you eXternal. I am now rather sorry that I asked that question in (obviously) the very earliest stage of my first pass - when I was uncertain if “it was just me missing something”. Had I waited a little longer the solid quality of the rest of the cluing would have made it evident that it was simply a typo.
Whatever, the rest of the experience was a very satisfying and fun solve that took me back to days spent with both victims and their replacements.