It was last moved in 2020 and doesn't appear to move every year. Moreover, it has been moved back in the past. I don't get the impression this is some cynical media ploy but instead an educational effort from some well meaning experts in their respective fields trying to raise awareness and provoke action towards remedying various existential threats, including nuclear war, but also climate change and biological threats.
"Atomic scientist" isn't even really a thing. This is a political advocacy magazine, and always has been.
The likelihood of an accidental nuclear launch was definitely higher then (e.g. by a submarine commander misinterpreting the situation). But I do think the likelihood of an intentional nuclear strike is substantially higher today. Some Russian decision makers seem to believe they could get away with a tactical strike. And then there's North Korea.
As for a tactical strike, this is the "Doomsday Clock" so that doesn't count.
That's because it wouldn't be Krushchev who would start nuclear war in 1962.