As a hiring manager I view Google on someone's resume as a non-signal. If however they are the sort of person who draws attention to having worked at Google I view that as a negative signal.
The frame of reference here is important, otherwise average is pretty meaningless since we have no objective list of what an average developer consists of.
They were also not "walking in to captain" anything. They were applying for standard engineering jobs. Think of an average individual-contributor software engineer from, say, Facebook. Is a smaller company really going to hire them as Director Of Engineering (a totally different job than software engineering), just because of the company name on the resume? That sounds absurd.
I was very skeptical about this, then I worked for one. Now I get it.
All I see is that faang is a term for expert code monkey.