This I understand. What I don't understand is ''they'' as it's plural. He's definitely one person unless he has multiple personalities. Then I can see the use of they. I want to learn not be a jerk here btw.
Not always though.
Think of it like when there are reports where they don't want to give away details.
"They victim has brought complaint to the police, they will now with with detectives to determine if there was a crime"
Or similar with juveniles.
"A juvenile at XYZ School was seen with a gun on campus, they were detained without incident"
It does get awkward when there is no antecedent, but there really isn't a clear singular word that exists.
Them/They/Their are very common with an antecedent.
Think "An individual does not need a gendered pronoun if they do not want one"
Slightly clunky with "Elliot does not need a gendered pronoun if they do not want one"
Only thing that has really shifted is that we gave the genetic individual a name.
It's awkward to then go "They do not need a gendered pronoun" for an individual - but it's been done throughout language because there really isn't an alternative
Can avoid it pretty easily though.
"If Elliot wants a donut, just give it to them"
It's those usages that are most common and really not wrong