The first section (3455) relates to his parole violation, but PC 211 is robbery. That may relate to a new charge, especially if his paroled offense was something different.
However, an arrest charge does not mean he will be charged with the offense. Since he is already in Humboldt, if he is charged with robbery, it is from an incident in that county, not Sacramento County. Otherwise, Sacramento would have held him until that charge was resolved.
What you can do for him is help him raise the money to hire the best criminal attorney available. It sounds like he is very early in the process so you and he have time to shop around.
My colleagues have given you helpful information.
I would just add this: if his court date is an arraignment, he will be in and out of court in 5 minutes. Your time would be better spent having a regular jail visit.