Yeah, politics is literally at a basic level just the description of group decision making and distribution of power and resources. Good luck avoiding that in any system/story that is based around groups of players or has more than one NPC.

I think it is referring to keeping real-world politics out of campaigns. Like for instance, one time during a campaign, we blamed a museum heist on Islamic terrorits. It made the rest of the game real weird.

Everyone is a rock and they just sit there eroding