Not really. I mean, this obviously depends on what you consider political, but as the maintainer correctly noted a flag doesn't have to represent a country. I can have my own flag. Depending on my prominence, my flag can be showcased in Wikipedia and you can even include it into your CSS library. People may even recognize it. If it makes me a "political entity" is an open question, however.

But filing tickets demanding to remove something from a CSS library because it "isn't a real country" definitely is a political statement. Which, for me, is always very unwelcome, but quite mundane at this point.