Everything the Supreme Court rules is an "opinion." And they're the ultimate arbiter of legal questions in the U.S.
Whether a statement is a fact and whether the person who said it is considered an "authority" or not are independent concerns.
And we are also 100% talking about public figures. "Public figures" include companies and it's a critical part of 1A since Times v Sullivan.
Google is a US company and has 1A rights. That's how it works. The rest of what you said is nonsense and is your idea of how it should work, but has nothing to do with how it actually works.