Yes Kendrick doesn't move but the camera does, so the focus should be different, especially the last part where it goes all the way out. Or maybe it's just a zoom.
There's a motor that is attached to a high-torque gear which drives the focus gear on the lens. This uses wireless signals (the specifics depend on the specific unit) to talk to a control unit, which a Focus Puller uses to wirelessly control the focus of the lens. The wheel is much the same as a normal follow focus wheel, so can be used to do repeatable focus moves. It's used often with Steadicam, jib and gimbal work amongst others, and can sometimes include Iris & Zoom motors and control as well.
In the case of a motion control rig, there are wireless systems that are keyframeable, so you can program the focus to move with the rig.
As said before, as Kendrick doesn't move, and the camera's position would be pre-programmed and set exactly, times to the song - the Focus Puller knows exactly when each focus position needs to hit, so even with a standard wireless Follow Focus it would be very achievable. Additionally, the depth of field isn't particularly shallow, so there's extra leeway.
Here's an example of a hand unit with Focus, Iris and Zoom controls (commonly called a FIZ)
Arri's WCU-4 gives you lens data readout (where available) and remote control of Arri digital cameras.
And here's an example of a motor attached to a lens: