Is there any public info on the alleged kill switch in case of an invasion?
I can understand the curiosity -- I think it's fascinating -- but to me it strikes me as the same kind of question as "Yeah, I know James Bond is a secret agent, but is there any way I can get a copy of his itinerary?"
But, who would go out on such a limb to actually confirm such a thing ...
It is, however - a near-certainty that it exists ...
... as are China's efforts to develop their own chipmaking capabilities.-
https://en.wikipedia.org/wiki/Scorched_earth
It's not an hypothetical question but a real military strategy.