If you are describing they/them and point to a singular person-no regular person would understand. They/them has a meaning-plural, a crowd-it could mean a million people, 10, 70, it could also mean non-humans, insect swarms etc eg when they fly, they flap their wings or when they run from a predator, they bunch up and keep their young in the middle of the herd.
. Writers especially LGBT friendly may use the term, but then again that broadens to say someone with multiple personalities. By forcing people to accept that word for a single person -it just makes it confusing.
A new word/term is best-language evolves- elevator, airplanes, submarines are all new words that got added as human understanding evolves?