Decertification is certainly a violation of free speech. It's a way for Twitter to de-legitimize people who'd previously proved their legitimacy the Twitter.
There is no constructive argument to be had and will only result in thread detachment and a stern warning by an HN mod. Let’s move on to a more productive line of discourse.
However, I notice that you don't have much to say about my argument against speech leading to violence. What do you think about that.