Honestly I’ve done mostly forgot, and with the proliferation of AI technologies and all the typos AI has read from in the training models, I bet AI isn’t always right about this either.
I usually just don’t care anymore, whether the autocorrect puts the apostrophe in or not.
Singular ‘they’ is centuries old. Apparently even older than singular ‘you’. It’s only recently that people tried to make it a rule that it should only be used as a plural, but really it’s used in natural language as a singular all the time like I did. (Did you notice it in the middle of my previous comment, not just the end?)
You never used the word they, you used the word them multiple times though.
Care to compare and contrast the difference?
It’s the same word in a different grammatical situation.