Thanks for trying to find this. I wonder what Moore would think about the egoist/ nihilist phenomenon & AP today, seems like he was one of the earliest to really delve into both with fervor.
I think the term "selife" was used for the first time the same year that he died: 2002. The world has changed radically and I think it's made it only more apparent that egoist approaches liberate solely in a transhumanist perspective. Sadly I think the hopes for finding this essay are looking pretty dire.
"There is no light at the end of the Carpal Tunnel." - Bob Black