If animals continue to exist in a post-AGI world, animal suffering will not persist
It seems improbable the current obstacles preventing reduction of animal suffering will be reduced because of AGI, and it seems just as possible the technological advancement would simply allow factory farming to continue on a greater scale. Since humanity's current de facto stance on animal suffering is causing it in great amounts, a tool that will probably make humans much more powerful and probably not any more ethical seems like probably not good news. (However, if AGI allows for advances to made in the field of cheap and realistic meat substitutes, that would probably be very helpful in reducing animal suffering.)
It seems improbable the current obstacles preventing reduction of animal suffering will be reduced because of AGI, and it seems just as possible the technological advancement would simply allow factory farming to continue on a greater scale. Since humanity's current de facto stance on animal suffering is causing it in great amounts, a tool that will probably make humans much more powerful and probably not any more ethical seems like probably not good news. (However, if AGI allows for advances to made in the field of cheap and realistic meat substitutes, that would probably be very helpful in reducing animal suffering.)