he does have first hand knowledge and experience
Exactly, the apparent nationality, sex, ethnicity isn't a reliable guide.
I'd no idea about:
Raymond Chandler wasn't American.
Leslie Charteris wasn't a conventional Englishman.
Van der Valk wasn't written by a Dutch person
I did know who Jack London was.
Robin Hobbs was a woman till after two or three books.
Didn't know J.V. Jones was a woman till after read one book.
Samuel Delaney
That Dracula was written by an Irishman.
I did know that I was reading translations of
Jules Verne
Jostein Gaarder
Georges Simeon
Franz Kafka (Amerika is really weird, because maybe he hadn't a clue? The others are better)
Alexandre Dumas
Carlos Ruiz Zafón (two books)
Cornelia Funke
Markus Heitz
Umberto Eco
Christine Nostlinger
Giovanni Guaresch
Tacitus
Niccolò Machiavelli
Antoine de Saint-Exupéry
Aleksandr Solzhenitsyn (Must read the updated First Circle, I read original English translation about a year after its release).
Possibly Kazuo Ishiguro writes in English?
I'm sure I've read other non English language, but fact is a tiny proportion of non-English is translated other than famous classics. Very much higher percentage of English Language is translated to other languages. My Daughter-in-law (the one born in Kazakhstan and brought up in Germany) is as widely read as I, but mostly in German, a lot of the English titles in German. I haven't established what the other Daughter-in-law reads, but she appears to only read in English, despite not being from the West.
I have a bunch of translations of Chinese Classics on my Kindle to read sometime
I read Monkey, but it's Arthur Waley's popular abridged translation retelling rather than a proper translation of Journey to the West.
Many apparently British authors write authentically about other countries (some are not really very British at all).
Joanne Harris (French people thought Chocolat would be rubbish, then after reading decided she must be French, the reality is more complicated)
Alexander McCall Smith
H R F Keating
Jack London
Nevil Shute
Leslie Charteris
Raymond Chandler
Nicolas Freeling
As an N.I. "ex pat" I'd not have suspected Bob Shaw, C.S. Lewis and James White of being from the Province. It just shows not everyone there is like Gerry Adams, Nigel Dodds, Ian Paisley etc.
If you read outside you comfort zone and read lots, you'll read a diverse selection. As well as new books I search Gutenberg and charity shops, I take advice from friends with no interest in SF or F.
I eventually get round to reading anything my wife likes.
(Though not sure about some of the recent authors!)
The idea that you'll broaden you horizons in some magically good way by reading only Black Women for X books in a row seems bizarre. You broaden your horizon by a mix of old, classic and new. By trying different Genres.
Read lots.
My daughter says books have better CGI than Films and better polygon count and frame rate than games. I can read LOTR faster and with less distortion than the full set extended box set of DVDs.
I've almost cut out TV watching so as to be able to spend more time reading and writing.
Must spend more time writing my books and less time writing here!