I think there can be arguments against the idea on the grounds that it's unlikely to be effective (though I think that a lot of people are misunderstanding what's actually being discussed), that misinformation is not generally as harmful as people think (
@Khabib Khanate made this point, and it's good, IMO), and even that it could be misused. It's specifically the idea that it's some kind of attack on freedom of speech that I think is hysterical.
Generally, rightists misunderstand freedom of speech on two grounds: 1. People who disagree with you speaking is not a violation of your freedom of speech. It goes both ways. 2. The purpose of freedom of speech is to enable truth to prevail. Fundamentally, if one doesn't believe in objective reality or that anyone is engaged in trying to find it, the basis is gone. Also, people are invoking Orwell while having zero understanding of his thought. As I pointed out, he believed that freedom of speech was only possible in a leftist regime, and he explicitly said that his main purpose for writing was to advance socialism, fight totalitarianism, and (this one is important) counter lies.