I've listened to it, and by cranking up the volume at the instant that he says it, I confirm that that's what he said. I've gone over those last few seconds of the recording several times
Okay, I have changed my mind.
After listening to the edited clip a whole bunch more, he says something like “How would you like to be in the White House...
He absolutely does not say the N-word, imo.
The biggest clue here is the lack of reaction.