Needless to say, I disagree that what Prof. Mantova is planning to do (digesting the proof and making it human-understandable) represents the "end of [mathematicians'] career". Systematizing has always been a key part of human mathematical work, and tidying up a raw proof can be viewed as a kind of systematizing.
My hope is also that Mantova and very possibly L'Innocente will get a substantial share of credit for their role in the resolution of this conjecture by Conway: the AI would not have embarked on this were it not for their prior work. So even human mathematicians with an inclination for more exploratory "problem solving" will have plenty to do in the future. (The story is actually not that different for the recent Navier-Stokes forced blowup result, which also built on key conceptual work from 2023 by Córdoba and Martinez-Zoroa.)
My hope is also that Mantova and very possibly L'Innocente will get a substantial share of credit for their role in the resolution of this conjecture by Conway: the AI would not have embarked on this were it not for their prior work. So even human mathematicians with an inclination for more exploratory "problem solving" will have plenty to do in the future. (The story is actually not that different for the recent Navier-Stokes forced blowup result, which also built on key conceptual work from 2023 by Córdoba and Martinez-Zoroa.)