It's easy to do and it was an assignment in class. When bees swarm they act like they are on drugs. They cluster around a queen. So this guy would have had to have some queens in cages attached to him and then his helpers just shook some frames of bees on him.
They also could have used queen pheromone and then set some swarms nearby. They would have had a short window to get them all to land and take the picture.
This guy probably “likes” bees, but the bees are attracted to the scent of the queen. And they are NOT in the stinging mode.
Anyone can do that, you just have to know how.
Maybe anyone can do it, but I’m not anyone. Not for all the hot air in Washington, DC.
Just out curiosity, how do you get them off again?