Firstly, I never claimed ChatGPT was the holy grail or end-all-be-all. Obviously it makes mistakes and I do not use it for any research purposes, as I like to get my sources myself instead of relying on AI. I just asked it for fun to see what it would spit out.
Secondly, Fedor winning two World 9-Ball titles in itself already puts his resume above Filler. That is insanely hard to do, a feat only a few top pros have been able to achieve (Ouschan, Biado, Hohmann, Fong-Pang, Archer, and Strickland x3). Filler has 1. I do not find the World 8-ball title to be nearly as difficult to win as a world 9-ball title. They are both equal in World Pool Masters and US Open.
Thirdly, most of those east Asia tournaments won by Filler, Fedor was not able to travel and participate in, due to his country's dilemma. Filler was able to freely travel and compete in any tournament he wished, and was not held back by WPA banning Russian athletes.
Fourthly, I think it does matter that Fedor won a lot of his majors in one year, as that is a rare occurrence in pool and a feat only 2 other players have come close to achieving, Yapp and FSR, making them the best players of that year. It is a good way to gauge who was the better player for that specific calendar year.