My own experience was seeing a huge commotion right in the city centre of Guangzhou, a megalopolis bigger than New York, without single mention in the media the next day besides some random youtube uploads.
I can co-sign that there are often incidents of civil unrest in China that are not reported in the media. However, from what i can gather, these are not explicitly anti-establishment. Most of them appear to be localized labor disputes or middle class NIMBYs making a fuss about development that inconveniences them.
For reporting on the former, you can check out China Labour Bulletin[0].
At least in 2012, there were apparently 500 protests _every day_: https://www.theatlantic.com/international/archive/2012/01/ho...
When I was there in 2014 there was a HUGE protest in Changsha. None of these are reported in the media inside or outside China.
I concede that my source on policy-making is dated, but I highly doubt the the functioning of a country as vast and complex as China can be completely transformed in forty years. Still, I'm not sure, so I emailed the author to verify.
I think there is a world of difference between protests (usually over eminent domain related concerns, not always) and an "uprising." I've tracked to track down some of these claims of 180,000 protests a year (following the links) and it's been hard - I find it hard to believe that these are very large protests.
b. China has substantially centralized post-2000.
I would go so far as to say it is close-to-useless to cite a 1988 book on modern China unless to reference its history, that's how fast things have changed.