It seems like a weak premise in that human intelligence is just Strong NI (Strong Natural Intelligence). What would it be about being Strong AI that it would kill everything when Strong NI does not? A stronger premise would be more fundamental, be a premise about something more basic about AI vs NI that would explain how it came to be that Strong AI killed everything when Strong NI obviously does not.
It seems like a weak premise in that human intelligence is just Strong NI (Strong Natural Intelligence). What would it be about being Strong AI that it would kill everything when Strong NI does not? A stronger premise would be more fundamental, be a premise about something more basic about AI vs NI that would explain how it came to be that Strong AI killed everything when Strong NI obviously does not.
But OK, its a premise for a story.