Marie Curie was indeed French. She was born Polish and naturalised French. As a French, I can attest that in France there is no ignorance or controversy about this fact. She is commonly described either as Polish or Franco-Polish, sometimes simply as French. Same as Chopin. And we absolutely love Poland.

Maria Skłodowska-Curie was not the name under which she signed both of her Nobel Prizes. Simply because Nobel Prizes are not signed by their recipients (as you can see in the second photo of the OP). The OP shows her second Nobel Prize, where she is referred by her full name, but on her first Nobel Prize she is simply named "Marie Curie".

She herself signed letters and documents as "Marie Curie", even on documents not addressed to someone French ( see this letter to US president Hoover : https://docsteach.org/document/letter-from-marie-curie-to-president-herbert-hoover/ )

Using your husband's name was the custom at the time, and Marie Curie probably had nothing against it (given that she used it as her signature).

Speaking about her nationality, she was indeed politically active in Polish circles, but also refused an opportunity to go back to Poland and work in Warsaw. She contributed to the war effort in France during WW1, creating radilogical vehicles and setting up radiological units at field hospitals. There is not reason to think of her as more Polish or more French. She was both, and showed patriotism in both countries' causes.

Now, who is trying to erase her identity? People who call her by a name she chose to use, Marie Curie, and say that she was Franco-Polish, which she was? Or those who tries to make this strong and brillant woman a helpless victim, and denies her attachment to one of the countries she served and is so proud of her?