sidis iq was only estimated unfortunately...
And as the new generations of humans figure out new technologies, most people are now smarter than James Sidis. The people back then didn't have many things we have now, which makes them less smart. We have knowledge of quantum physics, coding, space exploration, which they didn't have back then.
That is a blatant false hood. He got into Harvard at 11. Just because we have more knowledge doesn't mean we are smarter.
I believe there is a 0 percent chance of that happening if sidis were alive. Even if he did study, Alphazero is a deep-learning AI. I don't think it is even possible for anyone to comprehend how deeply he can calculate. Also many psychologists say that no matter how intelligent someone is, it would be nearly impossible for the human brain to calculate past 25 moves.