You mistake my meaning, I think.
I'm not talking about the ability of AI to get into systems that are digital, electronic or otherwise part of the Internet of Things.
I'm saying that AI can't magically hack my fridge, my car or my electric drill, any more than it could magically hack a banana or a skateboard, because there are still things that are manifestly outside of its scope.
Let's say weaponry, infrastructure and a chem lab or two are "in scope". That still leaves raw resources (water and food), physical tools and physical distance as key advantages of (some parts of) humanity.
Not me, but it's also not the case that the Alexa in my house could start throwing ninja stars at me, or contaminate the oat milk my son drinks in the cupboard.
But critical systems absolutely can be airgapped from AI. People don't, is the issue.