I've not received any transcripts or refferals to any word I apparently used that was offensive or inappropriate. Not one.

The official statement just reads;
We are writing to inform you that a warning has been issued to the FINAL FANTASY XIV service account registered to this e-mail address on 28/05/2019 due to a confirmed breach of the following rules and agreements:

3.3 Profanity and Offensive Language. You may not use profanity or any language that a reasonable person would find offensive. The Game is for players aged 16 and older except players who are resident in Germany, Australia or New Zealand where the Game is for players aged 12 and older. You agree to behave accordingly.

We found evidence of this violation from the following behaviour, which led to this warning:

- Use of inappropriate language.
Nothing else.