“Everyone discussing some fission superbomb is falling for the hype.
Nuclear reactors are dangerous not because of some sci-fi chain reaction that might or might not happen, they're dangerous now for perfectly predictable reasons stemming primarily from radiation and radioactive waste.”
The straight forward mitigation for the hypothetical situation is to halt development; this is not what the ai companies are pushing for, so I'm not convinced that this line of thinking can be meaningfully attributed to the marketing strategy of ai companies.