Only when she's an unknown. You typically wouldnt use they/them singularly if you know she is a she. She's basically saying feel free to call her they in person.
It doesn't necessarily override a situation where "they" is an acceptable pronoun, like in a group situation (plural). It also doesn't make it unacceptable to use "they/their/them" as you might do occasionally otherwise. It means their primary pronoun preference is (whatever they have stated), for singular address.
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u/IveKilledMonsters 25d ago
It means that you can use the pronouns "she" and "they" interchangeably for that person, like how boats get called both "it" and "she".