Yeah, but you’re using it to mean “I don’t know which pronoun to use.” This is a different meaning than what’s being describes here.
What’s being described here is a person who decided that they don’t want to be referred to as he or she, and has chosen to make themselves plural instead of using the singular nongendered pronoun already present in English.
Since that is a grammatical error, and this is the internet, I am obligated to ridicule this person, regardless of how well their meaning is conveyed.