That is true, but the difference is the lack of accountability, which is cultural/societal/political - there are virtually no external forces to counter a potentially dishonest official narrative.
A one party state means that there is no pressure from political opponents (political battles inside the party will never trump the party itself). And there is no pressure from journalists - China has the worst score for press freedom [1] (bar Eritreaa, Turkmenistan and North Korea) with a downward trend over the last decade. If there's no one to hold your feet to the fire, there's little incentive to self-incriminate.
In theory that might be true, and it's the way they teach it in American civics class.
In practice, Xi went on an 'anti-corruption campaign' that purged all his political enemies from power as his first initiative. The exact opposite of what your theory predicts, and actually a stronger cyclical purge than our typical repubs->dems->repubs one.
The campaign was a unique event in decades of party history and the Wikipedia page for the campaign lists 4 different theories for political motives. I'm not sure you can view it as a sign of a culture of healthy accountability.
The point remains that they have politics. It's not some lockstep monolith.
As far as which culture has more healthy accountability.. plenty of corruption to go around on all sides, the comparison would be pretty nuanced.
I'd say that China has a lot more low-level corruption, as a bigger % of their economy, what with large swaths of the country being pretty third-world, but also more accountability for senior people who fuck up badly. They executed a baby food exec who poisoned kids, while nobody saw a day in jail for poisoning the city of Flint. Rick Snyder probably has a nice lobbyist job.
Or, look at Covid -- the mayor of Wuhan and governor of Hubei were sacked over their poor initial handling. Is NY gonna elect a Republican over it? TX elect a Democrat? No way in either case. Maybe we have less accountability in some ways specifically due to the 2-party system's polarization. Arguably Trump lost over it, but the guy literally got covid, right before the election, after downplaying it for 6 months and still got the 2nd most votes in history.
I think it is probably more accurate to say that they have "factionalism," rather than "politics." China has had a one-party system with strikingly low participation (~6% of national population) for the past seven decades.
They have politics, but (in the absence of parties) not partisanship in the narrow sense. Elections and parties aren't politics, they are just key mechanisms of politics in liberal democratic states.
>Or, look at Covid -- the mayor of Wuhan and governor of Hubei were sacked over their poor initial handling. Is NY gonna elect a Republican over it? TX elect a Democrat?
I mean, whoever they replace the mayor of Wuhan and governor of Hubei with will certainly still be members of the Chinese Communist Party. NY and TX might not flip their governing parties, but I'd be much more willing to assure you that the process of choosing their replacements will be more transparent than that for Wuhan and Hubei.
They won't flip parties and no incumbent is ever at serious risk of a primary challenge. You can call it transparent I guess but it's also a foregone conclusion.
A one party state means that there is no pressure from political opponents (political battles inside the party will never trump the party itself). And there is no pressure from journalists - China has the worst score for press freedom [1] (bar Eritreaa, Turkmenistan and North Korea) with a downward trend over the last decade. If there's no one to hold your feet to the fire, there's little incentive to self-incriminate.
[1] https://rsf.org/en/china