In that video there's a screw to hold the mesh cap cover and another one to hold the actual capsule (which looks exactly like the housing of the CK1 cap) onto the preamp. DOesn't show any threads at all.
It's a possibility - and I'm purely speculating here - that the screw that holds the capsule cover in place also provides the ground for the circuit. Other mics have the ground to the body at the capsule.