I think this is the crux of the entire problem for the author. The author is certain, not just hesitant, that any contribution they would make to project involving AI equals contribution to some imagined evil ( oddly, without explictly naming what they envision so it is harder to respond to ). I have my personal qualms, but run those through my internal ethics to see if there is conflict. Unless author predicts 'prime intellect' type of catastrophe, I think the note is either shifting blame and just justifying bad outcomes with moralistic: 'I did the right thing' while not explaining the assumptions in place.