Because it's not a list of "banned words". It's a list of words or phrases that might accidentally cause offense (apparently similar to some of the entries on the public style guide: https://developers.google.com/style/word-list).

For that role, there's no need to include the n-word, because nobody is going to accidentally put that in a press release.

(Of course, the lists were apparently compiled by total dorks who put in things like "terminate", "dummy variable", and "native". But the list being dumb is a separate issue from it from what you raise).