I don't know if it was intentional, but Copernicus and Marie Curie-Skłodowska in an "who else" sentence like that sounds like partial setup for a well-known polish joke/meme from the movie "Sexmission", where few men wake up from cold sleep far in the future after war, to find a society composed of only women.
Treated like curios, there happens a dialogue that essentially goes:
(man, defending the idea that men could have produced exceptional works):
M1: "For example Copernicus"
W: "Liar, Copernicus was a woman!"
M1: "And Einstein?"
W: "was a woman too!"
M1: "And maybe Marie Curie-Skłodowska too!?"
M2: "uh, that was not the best example"
M1: "they confused me..."
I'd say a pretty obvious test for "nationality" of Copernicus would be the fact that he fought on polish side in the wars in Prussia, as the royal prussian protectorate didn't exist at the time. But if you look using a later map, you might get confused on that.
As for naming, at least in some circles it used to be the norm to use local language forms of names - this for example led to such "polonized" names like
"William Szekspir" = William Shakespeare
"George Waszyngton" = George Washington, etc.
Chopin ends up a curious case since he is written and spoken the french way, without any mangling.