I am extremely skeptical in anything Google states that they aren't using for ads and / or user tracking. There's plentiful of examples proving the opposites and it is littered with "whoopsies". Remember the time they "accidentally" equipped their google street view cars with Wi-Fi scanners? It's old but still is true. That happens to me too every now and then. Or how they see themselves above the law with their Google Analytics opt-out plugin that is the complete opposite of what the GDPR states.