It says they didn't find anything on him. So if he cheated: 1) it was with a new unknown method/gadget in his body/clothes 2) it was someone from the audience

It says they didn't find anything on him. So if he cheated: 1) it was with a new unknown method/gadget in his body/clothes 2) it was someone from the audience (they switched off the internet broadcasting so anyone outside could not help him any further) 3) the method he used to cheat was destroyed/hidden before the search (eaten, thrown away, etc)