I appreciate the tone of this article. I am exhausted by the usual existential fear, but doomers are in good company -- during the development of the OG atom bomb, there was fear of the possibility that the fission chain reaction would not stop and all life-as-we-know-it would be destroyed upon detonation. I look at the idea of a rapid AI induced material "robocalypse" (robot-apocalypse) as a similar projected fear, and the result being similarly unlikely, particularly in the near term (coming decades). Even with AI access to sophisticated 3d fabrication facilities, there will be severe supply chain constraints that would impede an overwhelming spawn of robots. If say China or the United States had a ubiquitous deployment of robots already, with manual and mobility capabilities roughly equivalent to humans, the concern would perhaps actually be warranted. We are far from that. Clownpocalyse fits the bill better. Much of the Clownpocalyse are in the ideas themselves, like Nick Bostrom's paperclip improbability.
The scenario was about the first fusion (hydrogen) bomb test causing a runaway "ignition" of the atmosphere. It was never considered likely, but they still did the math to make certain it couldn't happen.