The people you are talking about have not advocated mass murder via nuclear weapons. The idea was precisely targeted non-nuclear strikes against only the servers themselves. (Which, would have plenty of forewarning to allow people to leave the building.)
The claim that they advocated for the use of nuclear weapons is a lie.
But you don't have to take my word for what the mentally ill AI doomer cult believes, you can take it from their leader when he called on states to "Make it explicit in international diplomacy that preventing AI extinction scenarios is considered a priority above preventing a full nuclear exchange, and that allied nuclear countries are willing to run some risk of nuclear exchange if that’s what it takes to reduce the risk of large AI training runs."
Don't make excuses for omnicidal authoritarian cults and their sadist leadership.