> I think you're technically right but missing what the guy is actually doing. When he says "this isn't about politics" he's not making some naive claim that governance exists outside of politics. He's saying "please don't retreat into the red team blue team thing here." And that's a legitimate move.
We've got a great term for the latter, and everyone is already familiar with it. Add the adjective "party". Done.
continuing off the tangent, "party" is a noun, not an adjective. In a construction "party politics", it functions _like_ an adjective, but it remains a noun.
Similarly, "computer" in "computer games" is a noun that modifies the meaning of the following noun. Modifying nouns like this always are in singular.
We've got a great term for the latter, and everyone is already familiar with it. Add the adjective "party". Done.