It was not so much the call for a complete halt that caused controversy, but rather this part of his piece in Time (my emphasis):
"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.
That's the kind of policy change that would cause my partner and I to hold each other, and say to each other that a miracle happened, and now there's a chance that maybe [our daughter] will live."
"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.
That's the kind of policy change that would cause my partner and I to hold each other, and say to each other that a miracle happened, and now there's a chance that maybe [our daughter] will live."