The robots would have had access to the source code and also the hardware manufacturing systems used to create the kill switch. One unverified silicon wafer == Game over
I have comment threads in my country's subreddit from that week, where someone wrote that their partner was returning from a business trip to Italy. Someone wrote, "consider quarantining for a couple of weeks just in case".
The replies in that thread were along the lines of "Pffff...If everyone did that the Earth would stand still, idiot!"
https://en.wikipedia.org/w/index.php?title=Detention_and_dep...
The oddness of the original...was it was possibly pasted from an LLM response?