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I see what you mean. I don't think it's racist though if you're classifying artists by their style, to classify those that focus on painting black people with that kind of style as such. Because you're classifying the style, not the artists' skin color (and there's logically a correlation between black artists and artists that focus on depicting black people). You could argue maybe that using the letter "n" could be…
My first assumption on encountering a table field with a standalone "n" would be that it's an abbreviation of "no". So I'm surprised people are assuming so strongly here that this is instead code for a racist word. This is quite a harsh accusation, given the lack of evidence.
It will be quite embarrassing all round if this just turns out to be a run-of-the-mill copyright strike, or similar.