Like for example:
"Hello, I know your weakness. You suck at larvae management."
During a game, your focus would mostly be on the larvae management, which would lead to your downfall, since your focus wasn't expanded anywhere else (it's not your usual playstyle). Hell, even if the fans knew I was lying, and he knew I was lying, he'd still try to fix it. It's part of the Korean work ethic, fix everything till it's perfect.
So saying, I think he might have a weakness that MKP knows of or thinks he knows of. But it's definitely real in my opinion :\. That, or I'm just concluding that everyone thinks like me.
Either way, you gotta enter the game with a clear head, and play as you usually do.