I wish writers — white, Black, Arab, etc. — would just say “I have X personal experience with this place/culture, have done Y amount of research, and have tried my best. But that doesn’t change the fact that this is SOME SHIT I MADE UP.” There are lots of things in our writing we can take a deep stake in — but ‘authenticity’ is probably the least productive one.
More to the point, I wish reviewers/critics would stop using this as a criterion. 90% of critical/readerly praise for authenticity amounts to either “this guy imagines this culture in a manner which agrees with my imagining of this culture,” or “I didn’t know anything about Malaysian street culture, but now I do!”