This is something I’ve noticed a lot among well-intentioned people who aren’t trans themselves. When talking about a trans person, especially in the context of talking about them before and after transitioning, they’ll use they/them instead of she/her or he/him, as the trans person in question goes by.
Did you intend to “them” this person?
Allies unaware of chosen pronouns will use the unknown they/them.
Rather, pronouns are bad shortcuts to address folks in a language, so this respondent abhors pronouns when writing about self addressals.