I love bold statements, and if you mention either LLVM or Chrome, it isn't as if the Google's C++ style guide is any piece of art.

Which anyone that bothers to make such claims, should be aware what it actually says regarding exceptions.

"On their face, the benefits of using exceptions outweigh the costs, especially in new projects. However, for existing code, the introduction of exceptions has implications on all dependent code. If exceptions can be propagated beyond a new project, it also becomes problematic to integrate the new project into existing exception-free code. Because most existing C++ code at Google is not prepared to deal with exceptions, it is comparatively difficult to adopt new code that generates exceptions."

They don't use exceptions, because already started on the wrong foot, and like legacy code of Titanic size there is no turning around now.

What does the Bible of idiomatic C++ says, aka C++ Core Guidelines?

It has several advices on E section, regarding exception coding best practices.