Personally I think Khan's insistence on not allowing comments on his posts is undemocratic and contributes to the toxicity of social media by generating suspicion and frustration at misuse of platforms supposedly enabling free speech and feedback; so I'm sceptical as to the moral ground he is inhabiting on this issue.
He references this "free speech" counter derogatorily to an extent in his comments, but the article completely omits his own controlling behaviour.