Our publishing company accepts diverse staff and writers, and non of them have to be perfect!
Yes VBB, she is suggesting that being a writer/editor of colour, perhaps even with ESL, equals not having a command OF the English language. That only POC have less then perfect English (far from it) Which seems a far worse assumption then what she accuses her critics of.
I see from her tweets she struggles with English and that wouldn't mean a thing if she were in any other line of work, then "Publisher". On Goodreads the criticism's of her book/s are that of poor sentence structure/grammar/typo's. She may not deem the criticism fair but like it or not perfect English is expected in English books, funny that.
Honestly I would be very surprised that she has "staff" but going along with that for argument sake.
If you publish in a certain language, you aim to compete with other books in that language.