As the original poster, you are ignoring the “real world” and “directly” parts.
Here’s a definition: “The activities or affairs engaged in by a government, politician, or political party.”
It’s simple. Don’t directly reference those from the real world.
This isn’t ambiguous or a blurred line. A game including a specific named or represented world leader breaks the rule. A game that includes a president of a vague or imaginary country doesn’t.