Inmates sent to state prison for one of the violent felonies listed in Penal Code 667.5(c) have to serve 85% of their sentences before becoming eligible for parole. This is a California state law and prison counselors do not have authority to overrule it.
Sometimes prison counselors will find that the court made a mistake in sentencing. For instance, they may think an offense qualifies as a violent felony when it does not.
However, there is no way to make a violent felon eligible for parole afte serving 65% of their time.
If he's serving time for an offense categorized as a serious/violent felony within the meaning of applicable Penal Code provisions that govern sentencing, he will not get a reduction - since the 85% is required by state law.