Nope, I'm Brazilian and this is "censorship at all"!
The general rule is that you have the freedom to do and say whatever you want as long as you don't harm others.
Unrestricted free speech simply does not exist and any free society will have mild censorship, otherwise a lot of terrorists, criminals and fraudsters could defend themselves under free speech.
Initially, consequences were not that bad (take down of some illegal posts), then they went to removal of recurring offender profiles.X ignored those Supreme Court Justice orders - their only legal course of action being to comply and file an appeal to the Supreme Court as a whole. That led to further escalation against their legal representation in Brazil and their executives (which is according to Brazilian law), which led to Musk shutting down the local representation rather than following the local law. Which put X in a non-compliance state and led to the order for its blocking.
If you understand the initial order to take down posts of defamation and illegal speech as censorship, you comply and appeal. Ignoring a court order is not a legal option.
In Brazil you can go to jail for a slur against a queer person. That is not the case in the U.S.
The question is not about Freedom of Speech, it is about changing the laws on what is protected and illegal speech. I do not like Musk as a person, but what he is doing is an act of civil disobedience. Civil disobedience is the active, and professed refusal of a citizen to obey certain laws, demands, orders or commands of a government.
I am wary of the tightening fence around what is protected speech. I am a historian, and the censors never end up being the good guys.
The moment that something is deemed "illegal" to express, there inherently is no more free expression present.
You can have freedom of speech, but there’s no country were it’s absolute. You’re always responsible for consequences of what you say.
Article 19
1. Everyone shall have the right to hold opinions without interference.
2. Everyone shall have the right to freedom of expression; this right shall include freedom to seek, receive and impart information and ideas of all kinds, regardless of frontiers, either orally, in writing or in print, in the form of art, or through any other media of his choice.
3. The exercise of the rights provided for in paragraph 2 of this article carries with it special duties and responsibilities. It may therefore be subject to certain restrictions, but these shall only be such as are provided by law and are necessary:
(a) For respect of the rights or reputations of others;
(b) For the protection of national security or of public order (ordre public), or of public health or morals.