I have seen a television interview with this guy. Living in a crappy little pensioner’s apartment in Moscow. Someone really should take up a collection for him.
He said all his training taught him that if the US ever launched on the Soviets it would be massive, not two or three missiles. So he ignored the false signal. For that he was summarily drummed out of the military.
The Russian BM Subs had a feature that caused the missiles to be fired if the sub crew was disabled. The sub we salvaged in the Pacific had a missile part way out of the tube.