No, they're there to deliver justice. Truth in courts can and does change often when new evidence is brought into view.
The idea that a single entity could somehow have a priori knowledge of truth, good enough to decide what is/isn't true in general, is a juvenile God fantasy. Truth is a tricky concept.
Hell, alex jones literally just got slapped for his speech.
At some point, you have to ask if banning something that's so pervasive that most (or even a significant minority) is a good idea to begin with.
Courts have always been responsible for determining the truth. Libel is a crime. Every criminal case has a guilty/not guilty decision that must be grounded in the truth.
https://www.signaturelitigation.com/high-court-confirms-that...
I agree that justice, in a philosophical sense, is a subjective concept.
I'm not sure anywhere has a ban on _all_ lies, though. You can generally say that the sky is green, or even usually tell lies about non-protected groups ("all lawyers are criminals" is clearly a lie, say, but unless the context makes it clear that you're using it about a particular lawyer, you're probably fine).
It would be naive to think such a government body would be impervious to corruption, or groupthink, or mistakes. In fact, it would be the worlds largest target for anyone who wanted to promote misinformation or bribe/threaten people to weaponize it against their enemies.
Every time a new political party came into power, their opponents would be censored and imprisoned. And at the same time, the people in that government body who get to decide what is true or not would miraculously see their personal wealth increase. What a strange coincidence!
Bad things can even happen by accident: look at how many people were shouted down for saying masks were a good idea when Covid started, and then were shouted down for not wearing masks a few months later. Or look at who was shouted down for saying that missile that landed in Poland might not be Russian.
When the censors get things wrong, and they have the authority of the government behind them, the consequences will be terrible. It would ultimately result the end of free society, and it would not take very long for that to happen.
I doubt such a system would ever be put in place, because politicians would be the biggest targets.