The result of these harsh restrictions is that there haven't been major outbreaks, I think the worst we ever got was about 120 infections daily, and only 213 deaths overall, with the last one being on September 14th.
The downside of this, is that the vaccination rate in HK is very low, because there's no difference between being vaccinated or not. You're subject to the same local restrictions, and subject to the same length of quarantine when you come back.
Vaccination rate spiked up recently, because a new "wave" has started. Newly discovered cases spiked to 38, and the government announced a new two week lock down to squash it. Ironically, part of the new cluster revolves around a party thrown by some government officials and legislative counsel members.
Note: I'm personally very unhappy with the situation in Hong Kong, but try to refer from giving my personal opinion, so it's mostly just fact based.
[0] https://en.wikipedia.org/wiki/Statistics_of_the_COVID-19_pan...
As far as the number itself goes: this article [2] is pretty polemic, but it does a good job of putting the number in the context of comparables from other countries. One thing discussed is that almost every country is underreporting COVID deaths due to systematic pressures, so journalists are in a bind about how to report.
While China is an extreme example, any site that wants to show you a table of data across time and regions would require infinite footnotes to describe ways the data might be right or wrong. Worldometer has a page that describes its methods [3], which basically says their policy is to aggregated data from official sources. I think that's reasonable, although I think they could use a bigger "this may be garbage in garbage out" banner so folks don't interpret carelessly.
[1] https://www.nytimes.com/2022/01/06/world/asia/china-xian-loc... [2] https://www.forbes.com/sites/georgecalhoun/2022/01/05/beijin... [3] https://www.worldometers.info/coronavirus/about/
We know several other countries with less strict policies than China maintained zero COVID for quite some time, or states within those countries (Australia for instance had COVID outbreaks they successfully confined to one or two states). Once delta hit, it became too difficult for those countries to continue, but we can see China is more authoritarian and their stricter measures may still be effective for now.
If deer get it and get good immunity when they recover, they won't necessarily be a long term reservoir, and so on.
However given there have been a number of small outbreaks they have either been very lucky it has never spread to a vulnerable person or they have covered up several deaths over the last year.
Western journalists and businessmen are on the ground throughout the country (not to mention family ties and communications between expat Chinese and their families) and if there were a major outbreak of COVID killing dozens or hundreds, i dont think they’d be able to cover it up.