If you literally typed the n word, that would be the reason I imagine. I don't see this as a sufficient sign to say the site is compromised. That your post about the site being compromised for something so trivial was also deleted doesn't strike me as odd either.

Edit: that being said, if there's more to it than moderation of banned words/claims about the site being compromised, that could be different. I don't use the site much lately.