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I think the implication is he was asking if white people could finally use the word. At best it's an inappropriate joke, only he then doubled down on it when asked about it later.
Huh, why?
He's in a room full of news people of various races.
"Does this mean we can finally..."
Why would WE refer to white people and not the group of newscasters?
Again, he's talking to a group of mixed race and using we.
The group does not have race in common.
The group does have news casting in common though.
His tone is what matters, but based on the text alone, you can read it two ways
1) does this mean white people can say the word, because the naacp used it once hundred times
Or
2) does this mean we, the news reporters,. can say nigger during the segment because we are reporting on an event where the express topic was the word nigger and bringing attention to the use of that word?
1 is obviously wrong. I see nothing wrong with 2, do you?