The video is a combination of two drills from 180 Shooter and Developing Basketball Intelligence: String Shooting Drill and Spurs Shooting Drill. More importantly, the drills teach basic spacing principles in relation to dribble penetration by a teammate. This was the final progression of these drills, and we moved quickly to the final progression because the players wanted to cheat: They moved on the pass rather than waiting to see the direction of the player's drive.
The drill isn't perfect for me, as I would not want a player to pass and stand, but it fits this team's offensive set and system, and it shows the basics of movement without the ball. My teams tend to play a four-out, so the next progression would be to add the pass and cut from the first player, and then do almost the same thing, with movement depending slightly on where the passer cuts after cutting toward the basket.