That's specific to chess. I am not sure there's a reason to extrapolate that to videogames. This is just a warning sign that normal distribution might not be a good approximation of skill for a specific activity (and so please check what the skill distribution is like for what you are trying to measure, etc). If that's the idea you wanted to convey, then fine.
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Added: change "might not be a good approximation" above to "might be somewhat worse than other approximations". Normal is completely adequate in the vast majority of cases, including chess. It's just that it might be improved with measurements specific to the subject.