A previous report on this outrage https://www.bbc.co.uk/news/resources/idt-sh/China_hidden_cam...
Same applies to many other sites. To westerners, the Internet is effectively unusable until you establish a vpn.
HN works though.
So they could make it plausibly look like it’s coming from a foreign IP while locally censoring the content on the site.
If you have control over the network, hijacking the whole site is easier to do than trying to MITM traffic between users and the site, since HTTPS would hinder your efforts. As long as you don’t start to do it too late that people have HSTS information saved in their browsers.