In the show, Numenor was absolutely packed with black and brown folks including the queen, except for a single scene where there's a Trump rally with a speaker raging about elves and 100% of the crowd was white guys. They're not subtle at all.
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Every European country simultaneously deciding to implement a caste system where foreign-born Africans and Arabs are the top caste is really weird. They weren't even conquered, they just all decided to commit suicide at the same time.
His entire role in the campaign is to be a bumbling old white guy sitcom caricature. The people who get really performative about blackface won't even notice and there's no way you could explain why it was bad to them.