To me, Kurzweil was a guy who did electronic keyboards in the 1980s. He had his singularity ideas; he would write about them on Usenet in the 1990s; I think there was a whole group dedicated to it that was his. He worked hard to popularize it and he succeeded.
Somewhere along the line he became important for other stuff, prominent, probably wrote books or did talks or something, got household name known and singularity is a word that everybody knows as either “computers taking over humans” or “human biology is extended by computers/robots/etc” or things like that.
I probably should give it more thought myself.