Earlier quoted context omitted.
readability grants a code reviewer the power to approve changes in a specific language
I was wondering if someone was going to ask. It's the most bizzare aspect of code reviews at Google. And "Readability" doesn't mean you are good at a language, it means you are good at it in the way Google uses it. C++ readability is the poster child of this. Borgcron, not so much.
Sawzall is another good example of an unreadable language.