I have never heard of Grok using actual slurs. Controversial reaponses from the custom tuned Twitter bot, sure. But never as far as a slur.
As long as it doesn't do it in a normal conversation there's nothing wrong with having a model that's actually uncensored and will do what you ask of it. I will gladly die on this hill.
But yes, I would say I was also "surprised" in the sense that you say because soon after the "MechaHitler" incident, there seemed to be revisions to Grok that clamped down on any prompt with a potential for displaying outright bigotry, so I did not expect my prompt to be successful on first try. Even now, I just asked it to render "a painting of the Seine, by a hypothetical Adolf Hitler who has won WW2 and has gone back to painting" — and halfway through producing a self-portrait of Hitler in Nazi regalia by the Seine, it suddenly shut down.
But in this instance you're explicitly ask for something. If it gives you what you asked for, what's the problem?