It's a fact that it is the collective perception. Whether people actually get to chill is team dependent but from my understanding you can't really do 30 hour weeks at Facebook, Amazon or Netflix, but it's more possible at Google.
And I think almost no one really works 30 hours productively at any company.
"Collective perception" is not meaningful evidence
The statement you challenged was "Google has long been known as the FAANG to go to if you want to chill, coast, and vest". Additional people chiming in saying they, too had this perception is evidence that that is something Google is known for, and not just by OP.