It implies unprecedented access for any outsider who is especially interested in Nic Hamilton and his family. If he's some sort of central figure in a documentary, Nic may be interesting or important enough to interest journalists who write for newspapers or other news sources.
I'm not sure whether people who make documentaries always refer to themselves as "journalists", however. I've never made a documentary, and I'm not a journalist.
Well, before that the narrator says that Nic has decided to participate in the Clio cup aiming for the big time although he has never raced a car in his life.
Then Nic says: "Years ago I’d never even be thinking about doing anything like that." And after that the narrator says the sentence in question.