Basically, instead of the slur filter replacing the slur with removed, it keeps the slur but finds the start and end of the paragraph containing it and turns the paragraph into a spoiler reading something like

More technically complex to implement, but this would prevent the slur filter from e.g. breaking links or making innocuous non-English content illegible. It also allows people to talk about slurs without censoring themselves, while still warning people^[1] who might not want to see that sort of thing.