The "based on Polish Culture" thing was always something that was said by like people who, didn't really look into Polish culture...a ton of the witcher stories
are reactive takes on existing fairy tales from completely different areas of Europe, not Poland. Factions like Nilfgaard are based on completely different cultures outside of Poland. Yes, by the time of the witcher 3, Poland and it's culture did have a direct influence on the world of the witcher as it exists in CDPR. But the book universe was very very different.
To bring the point home, this is literally a quote from the author.
""I've said it once, and I'll say it again:
there is no deliberate world creation in my books! When it comes to the ontology of the entire civilization, it is rudimentary, subservient to the plot and only the plot. (…) My world is a pseudo-world, a mere background, a picture on a canvas moved by a reel. And it's justified – after all, the story in the books is about the fate of the characters, not about the fate of the world; the setting serves the plot, not the other way around.""
So kindly stop citing "But Polish culture" as an excuse to not include PoC in a fantasy series, because there's ALWAYS SOME EXCUSE to not include PoC. it's a symptom of a larger problem in media that needed to be dealt with.
""I've said it once, and I'll say it again: there is no deliberate world creation in my books! When it comes to the ontology of the entire civilization, it is rudimentary, subservient to the plot and only the plot. (…) My world is a pseudo-world, a mere background, a picture on a canvas moved by a reel. And it's justified – after all, the story in the books is about the fate of the characters, not about the fate of the world; the setting serves the plot, not the other way around.""
-Andrzej Sapkowski