It is absolutely a crime to conceal evidence in an ongoing criminal trial. The contents of the publications is absolutely irrelevant: the individual was asked to conceal evidence and agreed to do it.
The leaders of January 6 got 22, 18 and 18 years for seditious conspiracy in an attempt to overthrow the government of the United States.
This guy got 30 years for not being at an event where an officer was shot (and it was unclear who shot first, according to the FBI) when one of the arrested asked him to move a box of zines.
Now if I murder someone then ask you to dispose of the murder weapon, I've only committed a crime if I am knowingly conceling or destroying evidence. Like, maybe I'm helping you hide possession of an illegal firearm. That may still be a felony but it's in no way as serious as if I knew you killed someone with it.
so, what did the zine mover know, exactly? Did they know there was going to be a protest? Graffitti at an ICE facility? It's unclear to me that there was any plan to shoot a police officer so it's hard to argue that they should've known that was the crime at hand. Were they moving the zines so they wouldn't get confiscated and they still wanted to distribute them?
Nothing about this amounts to "domestic terrorism" under the most generous interpretation of the prosecution's theory of the case. They invented a domestic terrorist organization out of whole cloth and then used it to justify conspiracy charges. There is no "Antifa" like there is/was al-Aqeda or the Proud Boys or the Oath Keepers. Who are the leaders? How do you identify members? What are there communications? It's all completely made up to justify excessive prosecution.