My brother has already served his minimum sentence for a felony DUI (3rd DUI and causing great bodily harm to another person). He has tasked me with investigating a supposed revision to Prop 57 that occurred in May that would extend the minimum sentence release to what he described as "semi-violent" offenders -- those who caused indirect harm to others as a result of their negligence. I can't find an answer to this for him and he wants to bring it up to the parole board because it would mean that he could be released within 60 days as opposed to serving the remainder of the full 7 years.
This is not a DIY project. Your brother has the right to be represented by an attorney he or someone on his behalf retains (meaniing hires and pay) or his Public Defender (if as I suspect a PD was appointed on his underlying case) at his parole hearing.
https://govt.westlaw.com/calregs/Document/IBBF93BB0642B11E19483B57F97A947E3?viewType=FullText&originationContext=documenttoc&transitionType=CategoryPageItem&contextData=(sc.Default)