Also to consider: China uses in-app browsing a lot, with interactive experiences very similar to websites built right in the bilibili/ali/wechat apps.
But that's also just chromium isn't it, much like a PWA? Unless they made something of their own.
Contrary to popular belief, Google only pulled Search business out of China. The rest of services is still hosted on Google.cn inside China. To download Chrome:
$ curl -svk 'https://www.google.cn/intl/zh-CN/chrome/'
* Trying 180.163.150.34...
* TCP_NODELAY set
* Connected to www.google.cn (180.163.150.34) port 443 (#0)
However the "Make searches and browsing better (Sends URLs of pages you visit to Google)" data won't be collected, because the connection would be blocked.
But in a market of near 1B internet user, not having a single site in top 1K suggest something is wrong with the stats. I wonder what are we missing from those numbers.