How would you explain his results in the Villava rapid... they scanned for devices, they delayed live broadcast, they had a 2 way mirror... and radio devices can be easily detected using even commercially available technology...
The only plausible explanation (if he is indeed cheating) is that he has the backing of a state or a large entity that is testing espionage devices... thats the only way this makes sense... and we are talking CIA, Mossad, KGB etc. etc. because the kid earning 2000/mo in Bulgaria will not have the financial resources to source custom-made hi-tech devices that are undetectable to commercial scanners.
Which brings me back to Ocams razor... cut off complexities give a simpler theory.
I like the notion that he is the world's greatest chess player that has ever lived, accuracy-wise, but is completely unable to count or tap his toe.