If you were playing yahtzee, and your opponent only rolled sixes, would you not say anything? No, no, rolling a six isn't proof of cheating—that's... that's ridiculous.
Also, don't tell me you need to roll more than sixes to win yahtzee, I don't know any other dice games.
The em dash is just something you can use to diagnose the "AI-ness" of some text, the same way a cough could mean a cold or it could mean something else. You don't need to be self-conscious about it.
Somebody else replied with the video that popularized this bit of insight.