Seriously, political self-identification is nearly meaningless. Drill down into actual current issues and you get a much, much better picture of what people really believe.
I don't think they must be uniform internationally. A big political gender gap opening up where one was not before is notable, even if the specific disagreements of the gaps differ.
That doesn’t mean we can’t broadly observe a spectrum in many contexts between traditional/conservative and liberal/progressive. Even if some of the facts and priorities change between contexts.
Did you actually read the article or at least the twitter thread? The interesting point isn't "two political ideologies" it is the answer to the questions.
Are you just caught up on this or do you have a issue with the questions and responses?
2 party systems aren't normal in most of the world. even in a western centric view that's not true... I'm struggling to see what leads you to say such an extreme idea as this.