Nope. Not correct. Companies have the same 1A rights, too.

In the US, it really doesn't matter who says it, the only thing that matters is who it's being said about.

If you are a "public figure" -- which is a much broader category in 1A law than you think -- then in order to prove defamation, you have to prove the thing was false _and_ that the person saying it knew it was false at the time. Not that they were mistaken, not that they were careless, not that they knew later, they deliberately lied and knew they lied as they said it.

If your next question is "how do you prove what someone was thinking", then yes. That is the reason it's nearly impossible.

Not talking about 1A rights or public figures. We are talking about

Opinions (Protected) vs Facts (Not Protected)

Defamation cases where individuals say something are usually considered opinions and companies are usually considered facts in the eyes of the courts. I say "Usually"

Defamation also DOES NOT require intent, but it requires a minimum level of fault (negligence)

Google saying something is unsafe in the web search or browser would not be considered an opinion because of their position of authority. It would not even be a debate since Google has already said they make decisions based on facts and data presented to them.

The only question is are they negligent in their assessment or response to a false report. And what would be the damages. In the case of a phishing report that is false courts would already consider it defamation per se (damages presumed)