On the contrary. Those sites are still free to say what they want. Google is not censoring their freedom of speech.

But freedom of speech also means you can't compel someone to say something they don't want to say. That's not censorship, that's freedom. You can't force Google to rebroadcast that message.

And if you think that's the first or only thing they choose not to show, you must be very new. Otherwise you'd've noticed by now that your search results aren't all full of child porn and other garbage. Google isn't forced to show that to you.

If you want to see things that Google doesn't show, you're free to find it by other means.