I think the reference might be that some versions of suffering focused ethics entails positions like antinatalism in the short term, and the extinction of suffering capable life as a great good in the long term.
considering the great amount of miserable, unworthy lives (factory farmed animals, heavily abused and tortured humans, etc) that exist and will likely exist even in some amount in even the "utopian" far future, it's reasonable for someone who doesn't think this all this can be counterweighed by any amount of pleasurable lives to consider permanent extinction as good.
and of course in the short term, suffering focused ethics may entail antinatalism as your children can't suffer, be abused, abuse animals, eat factory farmed meat if you just don't have children.
considering the great amount of miserable, unworthy lives (factory farmed animals, heavily abused and tortured humans, etc) that exist and will likely exist even in some amount in even the "utopian" far future, it's reasonable for someone who doesn't think this all this can be counterweighed by any amount of pleasurable lives to consider permanent extinction as good.
and of course in the short term, suffering focused ethics may entail antinatalism as your children can't suffer, be abused, abuse animals, eat factory farmed meat if you just don't have children.