I am not a scientist in this field and can not evaluate the quality of his studies. But if you let ChatGPT do the "non-scientific" work, this seems to be okay to me. Also, I think that with the time there will be better mechanisms for evaluating studies/scientists as generating spam will be easier. But nonetheless, I think these rankings don't fulfill a scientific need. A scientific discovery can be important, but that doesn't mean anyone recognizes that.