Except he hasn't had a trial (for this particular offence), he was never going to have a trial. And his status as a right wing figure is almost exactly what has given him a 13 month sentence. Last year he got a suspended sentence (basically nothing) for "Contempt of court". He did the same thing again (cause he is kinda stupid), and got thrown in jail for 13 months. This is not the appropriate response.
There are two issues here. Blatant media censorship, and the fact that UK government has just demonstrated you can get 13 months for live streaming outside a court building (it's not a good idea to to do it in the UK anyway, if I did the same thing I'd probably get a police warning. However, the point stands.).
His status as a right wing figure does not play into his sentence at all, and if it does, you haven't presented any solid evidence that it does. If you can find the case of a non-right wing person doing the same crime and receiving a smaller sentence, i'll believe that theres some sort of judicial bias involved.
You could call it blatant media censorship, but its pretty obvious WHY the media is being censored. I've explained it before as well. It has nothing to do with what his viewpoints are, per se, but it has all to do with the fact that he has a political stance. Because of that, the jury will be swayed by his viewpoints inadvertently. The gag order ensures that the jury will have the least amount of bias possible during his trial.
Also he is going to have a trial. It doesn't actually make sense for someone to be sentenced to prison and not have a trial. That's just like, authoritarian autism
Tommy Robinson's risk in prison has absolutely nothing to do with the gag order. He's going to prison either way, that's entirely on him for receiving contempt of court. You can't just say "my client raped someone; there are people that kill rapists in prison, therefore my client shouldn't go to jail" that's just stupid. If he's being threatened by muslims in prison he can probably request a transfer or a personal guard
His sentence is 13 months. That won't change at all, and him being an alt right figure doesn't affect that sentence.