alt Hacker NewsNB: this is not "IPv6 traffic crosses the 50% mark" but "availability of IPv6 connectivity among Google users", which is a very important difference. This means roughly half of Google users have IPv6 capability, which does not 1:1 correspond how much traffic is actually transferred over IPv6, which is what this submission says in the title.
It also means you're excluding China, who has has it as a long-term priority to deploy IPv6 and have made huge strides.