When you are the size of Google I’m not sure how to tell managers across the company to assess poor performers and _not_ have it leak to the press. It’s not like this is a company press release.
Relative would imply they have good skills, but don't meet Google's extreme requirements.
Or because Google is nowhere near being truly "hardcore"?
At Google, or any large company, there are plenty of people who for various reasons just aren’t good performers but don’t get cut. The requirements to stay on there are not “extreme”.