I've never seen a workout video that shows any missing shots so I wouldn't take the video as a the holy truth.
Perhaps you should watch this one again, as it contains several missed shots by both Paige & Azzi. On the other hand it contains a lot more made shots, frequently taken in sequence, where Paige and Azzi both drain multiple shots in a row from all around the arc, as well as midrange jumpers.
This is a “shooting drill” where players are required to move with and without the ball, as well as catch and shoot, at a fast pace to simulate game conditions. It is exactly the kind of shooting drill that UConn runs every day in practice, and Paige and Azzi are as good as you’ll see at knocking down just about every shot they take.