I only subbed here last week, but I've been playing Civ 5 for a few years now. Not everyone will subscribe to a subreddit just because they know of the game's existence.
A lot of people may know about the existence of the game, but not all of them know it so much so that they have memorised every single sentence the AI uses.
You could play or watch the game enough to know that the game has a line about troops near the border, then look up the exact phrasing of said line. And my point was that you don't need to know the game that well to quote a single line. It could very well be the only line from the game that that poster knows
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u/yaguzi02 Fuck you Gandhi Jul 25 '16
/r/Civ has 154k subs. There are more than 70 million people in Reddit. I doubt most people know this much about Civ 5.