Provided he reviewed it and checked the readme is telling the users what it needs to tell them - what's the issue? I've found documentation to be one of the better tasks AI can perform and see no reason why not to use it provided a human is in the loop.
I think this is a very good point. We have a natural bias toward human output as there is an illusion of full control - in reality even just from a solo dev perspective you've still got a load of hidden illogical persuasions that are influencing your code and how you approach a problem. AI has its own biases that come out of the nature its training on large unknowable data sets, but I'd argue the 'black box' thinking that comes out that isn't too different to the black box of the human mind. That's not at all to say that AI isn't worse (even if quicker) than top developer talent today writing handwritten code - just that the barrier to getting that level of quality isn't as insurmountable as it might appear.