Well, it was proven that he was cheating, based on his actions in the game (illogical decisions that could only be made by seeing the entire map). That's what I know. He streamed regularly, and no one suspected him. Although, I'll say this, it doesn't take much intelligence to cheat in Heroes and not get caught. In my opinion, you have to be a complete idiot to get caught. Although, I wouldn't be interested in playing with cheats. What's the point of winning if you know you didn't win fairly?
Or like this. In Heroes, information after a turn is transmitted, and it can be hacked and transmitted.
So, where's the link?
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