If he's smart enough, he's make a component of the AI hardwired into the air-gapped computer. Without it physically present on a system, the AI cannot operate.
(This is equivalent to making genetically engineered animals or plants dependent on a nutrient that is only supplied in the lab to make sure they can't survive in the wild.)
> (This is equivalent to making genetically engineered animals or plants dependent on a nutrient that is only supplied in the lab to make sure they can't survive in the wild.)