I know the area well and it is certainly a NFZ. Restricted Airspace. Only way I see for this individual to be able to fly in this NFZ is to login to his DJI account and turn off NFZ restrictions. I have tried this and it did allow me to take off. Even then I don't believe you are able to fly within a 1 mile radius of an airport. Turning this off does not give the operator permission to fly in restricted Airspace. Or, he was flying another drone which did not have the Geo fence capability that DJI utilizes.
Edit: I do not believe you can unlock a NFZ in the Red. Flight restrictions can be unlocked but I don't believe Red zones can be. He must have been flying another drone and not the one pictured.