This is why I said some. I'm aware that not all or even most political scientists do this. However, my impression is that there are some, and I've had my impressions confirmed talking with people more knowledgeable of the field than I.

(Also, looking into the factors driving growth in China is somewhere in the fuzzy gray area between economics and political science. Even if I were saying that most political scientists committed this error, I could easily attribute your counterexample to the influence to economics. But that's not what I'm saying. But it still seems plausible that economists had an influence there.)