I think the author was quite honest about the weak points in his thesis, by drawing comparisons with cars, and even with writing. Cars come at great cost to the environment, to social contact, and to the health of those who rely on them. And maybe writing came at great cost to our mental capabilities though we've largely stopped counting the cost by now. But both of these things have enabled human beings to do more, individually and collectively. What we lost was outweighed by what we gained. If AI enables us to achieve more, is it fair to say it's making us stupid? Or are we just shifting our mental capabilities, neglecting some faculties while building others, to make best use of the new tool? It's early days for AI, but historically, cognitive offloading has enhanced human potential enormously.