Words have meanings and these meanings are not and never have been limited to their most narrow etymological origins. Incel being a shorthand for literal “involuntary celibate” does not mean it is never allowed to mean anything else, much as auspicious does not mean it is seen by looking at birds. Incel at this stage refers to an online subculture and it even means this in languages other than English where neither involuntary nor celibate are used as words.
It’s very strange to me to see how people now seem to be using death of author to completely disconnect the artist from their work in terms of culpability or consequence. I used to never see it as anything but meaning of a work is not beholden to author intent, whether due to author intent being unknown or the meaning transcending author’s own intent or even it betraying the author.