Exactly. If a game has an element of chance, then a player's top scores will tend to be top scores in part because of luck helping there (same reason as why regression toward the mean [1] exists).
In such a game if each player can choose how many times they play then they can gain an advantage simply by playing more. And their top games will look more and more statistically unlikely. That can be especially surprising if they only report those top games, which is the case here.
What would be interesting to compute is how many more games does a player need to be playing in order to reasonably get the results in the article. If it's 2x, it's not proof of cheating. But if it's 1,000x then maybe it is, because who has that much free time?
In such a game if each player can choose how many times they play then they can gain an advantage simply by playing more. And their top games will look more and more statistically unlikely. That can be especially surprising if they only report those top games, which is the case here.
What would be interesting to compute is how many more games does a player need to be playing in order to reasonably get the results in the article. If it's 2x, it's not proof of cheating. But if it's 1,000x then maybe it is, because who has that much free time?
[1] https://en.wikipedia.org/wiki/Regression_toward_the_mean