The book review you linked offers the thesis that Wang Huning is mostly repackaging the American self-representation of the time for a Chinese audience:

Commentaries on the book hold up Wang as some kind of incisive critic of US society. This was not my impression. My impression was that he opened a newspaper, read the criticisms Americans were making about themselves, and relayed them back to the Chinese.

Any discrepancies are more likely to arise from drift over time and Wang's lack of affiliation with any American political tribe, so he freely mixes Democrat and Republican narratives. Republican media stress how Democrats suck, Democrat media stress how Republicans suck, outsiders consuming American media get the impression that Americans suck.