Not sure that applies to arbitrary documents that the bearer claims is a warrant, rather than a judge-signed warrant.
Either way, it wasn't illegal to send them to where they needed to go, and it wasn't illegal to let this dude use another door, so the illegality seems to depend on whether the executive can concoct their own warrants without any oversight and gain arbitrary access for arbitrary reasons.
> The judge seems to have deliberately escorted the defendant to the jury room for the purpose of letting them hide/escape arrest.
Was the judge, beforehand, served with a judge-signed warrant indicating that they intended to, and were authorized to, arrest this person? If not, then it wasn't letting them escape arrest, it was letting them escape from 2 random dudes who may or may not even be law enforcement, much less law enforcement judicially authorized to arrest the dude.