Comment by Thorrez
KVM in this context stands for keyboard, video, mouse. There are multiple types of these KVMs, and the ones discussed here are remote KVMs.
https://en.wikipedia.org/wiki/KVM_switch#KVM_over_IP_(IPKVM)
It sounds like the North Koreans pay 1 person in the US to have a ton of laptops with KVMs attached to them, and those laptops are remotely used by North Koreans.
Not to be confused with Kernel-based virtual machine (also called KVM):