It's not exactly a secret. See, for example, censorship in Turkey and India. In general, he's overwhelmingly approved censorship requests from authoritarian governments. So much for "free speech absolutism".
In general, Musk himself regularly shouts his biases at the top of his lungs, and has applied selective enforcement of Twitter's own TOS. His selectivity can be easily aligned with his biases.
Why the double standard? He wants a pliable, aligned government in Brazil so he's using his megaphone to try to achieve that.