The terms of your husband's parole will dictate whether it will be revoked. A preliminary hearing addresses whether there is probable cause that your husband committed a felony. It will not deal with his parole. That will be addressed at a separate hearing. I suspect the preliminary hearing you bring up is a result of new criminal charges being brought against your husband.
This response is being provided for information purposes only and does not constitute an attorney client relationship. Furthermore, I am only licensed to practice law in the State of Illinois. While there are oftentimes similarities between States' laws, there can also be large differences. You should not rely on this response as legal advice and are highly encouraged to speak to an attorney licensed in your State for an accurate legal answer.
The preliminary hearing does not look into his parole violations. The only way to fix what you may have caused -it is not clear from your statement- is by informing his PO and the then executing an affidavit. He needs a lawyer who also needs to be aware of the false report you submitted.
This is not legal advice. This is merely a recommendation on how to get what you need from the Court.