I wonder haw many pages on a typical website you'd need to browse to let Tencent de-anonymise that k-anonymous hash-prefix scheme?
If Tencent added ihatetheccp.com and ihatetheccp.com/about and ihatetheccp.com/news and ihatetheccp.com/blog and ihatetheccp.com/donate to their "unsafe page" list - I suspect the pattern of fetching of the full list of urls for some of those specific hash prefixes in a short time would allow Tencent (or Google) to make reasonably accurate assumptions about which site you're actually visiting.
If Tencent added ihatetheccp.com and ihatetheccp.com/about and ihatetheccp.com/news and ihatetheccp.com/blog and ihatetheccp.com/donate to their "unsafe page" list - I suspect the pattern of fetching of the full list of urls for some of those specific hash prefixes in a short time would allow Tencent (or Google) to make reasonably accurate assumptions about which site you're actually visiting.