"If you tell a lie big enough and tell it frequently enough, people will eventually come to believe it". What is an example of this happening today?

They literally have 9 parties

Does dissuade from the fact that only Communist-party backed candidates can appear in the election. This was the reason there were so many rioters in HK. And hence, why so many were imprisoned or ran from the country for asylum elsewhere.

That propaganda:

Propaganda is a made up narrative to persuade an objective viewpoint. What is happening with Uighurs has a lot of factual video evidence, including first hand reports from those who fled to Türkiye. If it is so untrue why won't China allow visiting diplomats talk about it?

is old news that was abandoned when the area opened up for tourism again, and there were magically no camps

Unbelievably crass opinion. https://www.wired.com/story/xinjiang-uyghur-culture-tourism/

Talking to locals about the camps was impossible. “You can’t really talk to them, because then you’re putting them in danger,” Wack says. “If you mention anything political, they cut the conversation short.” Because he couldn’t visit the camps themselves, he was forced to suggest their presence by documenting how the region has changed. For decades, the Communist Party has been trying to eliminate markers of Uyghur identity and remake Xinjiang so that it appears more “Chinese.” As part of the Belt and Road Initiative, the government has been building major infrastructure projects like high-speed trains and superhighways through the remote province. It has also encouraged Han Chinese, the country’s dominant ethnic group, to move to the area in order to dilute the percentage of Uyghurs living there.