[ben_w]

As with all groups, the loudest are the least well-adjusted.

Thus, while it may linguistically be the western version of some exotic-sounding Japanese word that translates as "single adult", the implication is the exact opposite causality of your question: they are single because they are bad, not vice-versa.

[mrangle]

And yet it applies to everyone who is without a partner. Not just to the loud ones. Your supposed implication seems to be something that another certain loud group desires. Not something that can be inferred by any interpretation of the English language that I was ever able to discern.

[burnished]

Absolutely not. When I was single and looking but not finding I was not 'involuntarily celibate', thats a designation you self select into.

Being an incel is something you choose. Everyone else just isn't having sex.