Seems to be a common problem. Look at this news article
My reading of Penal Code 3058
is the same as yours. That is, it specifically applies to those inmates who are presently serving a term for a violent felony
, which, according to the information you've provided, this inmate is not.
My suggestion is that you contact the criminal
lawyer who handled the case and tell him that you have reason to believe that his client is being improperly held beyond his release date. Ask him if he could prepare a writ of habeas corpus to bring him before a judge who could hear the facts of his unlawful detention and order his release (and whether he thinks that's advisable or likely to end up keeping him in longer).
Also, if held beyond his release date, he will have grounds once he's out for a civil suit. For every day he is being held beyond his lawful release date, he should be able to be to get damages. For that, you'd need a civil attorney but you can discuss this aspect with the criminal lawyer too, as if you're interested in recovering damages, it may make a difference in how he'd recommend proceeding on the present situation.
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This is informational only and is NOT legal advice. There is no attorney-client relationship. You are advised to consult an attorney in your state for specific legal advice.