This is a great speech, and I recommend anyone to listen to the whole thing.
An aspect it doesn't touch on is that today, free speech is often legally constrained by social networking sites, when they are, all too quickly, label certain things as "misinformation" or "hate speech", censor it, and ban the author. Facebook is particularly brutal in this regard.
The problem with saying that something is "misinformation" is that it must mean "something we believe is false". If I claim that it's raining, and you that the sun shines, then we both just say what we believe. Unless we express our mental states ("I'm cold") we never express facts, just our more-or-less justified beliefs about states of affairs. You can't "ban misinformation", you can only ban information you believe to be false. When an authority controls "misinformation", they are necessarily forcing their beliefs upon others.
Second, "hate speech" is an insidious concept. It ascribes a motivating emotion to some speaker where it is unobservable from the outside whether that emotion even exists. Claiming that something was done out of (unobservable) hate serves as a convenient excuse to ban things where the observable evidence isn't sufficient.
Of course many of those pieces of alleged hate speech and misinformation aren't illegal in many countries, but that's of little help when they are banned on sites like Facebook or Reddit. Allowing speech only where it is hardly audible is not much better than banning speech outright.