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I don't think GA matters. For one, they have officially stated that they don't.
If you're sceptical, you should look at things from their side. They couldn't use GA data meaningfully in the algo, as not every website has it installed. Maybe they could GA to discover some naughty things, but I'm pretty sure they won't use the bounce rate from there.
However what they do have is people logged into Google doing searches, Chrome which is the #1 browser now, and they have the public Google DNS servers even. Those produce meaningful data.
(It's another question which of it is that they use, but some of it for sure.)
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