It’s literally already documented that ESL speakers and people from outside US/UK sphere get flagged by this stupid “AI detection” nonsense more often. Because they know more uncommon words.

To my brethren: Stay resolute. Nay, your vocabulary training was not in vain. Never diminish your communicative abilities merely due to prevailing idiocy. Signed… (Verily, never mind, I shall use proper punctuation for this one.)
—some lass from the far north of Fennoscandian wastes