Superman is a fictional character. Therefore, the superhero can be anything the producers want him to be.
He’s a defined character in a heritage piece of fiction. Superman is a pop-culture icon. A mythological figure much like the Norse gods.
He is white. Period. His creator made him so.
I guess “cultural appropriation” only applies to whites.

Non-whites can create their own stories.
P.S. You’re a fool and a cuck. HTH