First of all in most cases there is no law that requires that you report any law, there are very few crimes which requires someone with knowledge to report a crime. Aiding and abiding or a conspiracy after the fact, it involves more than just not reporting a crime it requires overt actions of someone concealing that a crime has been committed.
Second, in many US states, Elders do have priest-penitent privilege. This has been found in Delaware, Vermont and Ohio. The activity falls within that privilege when the elder is acting in their capacity providing spiritual advice or guidance to a parishioner. The idea that it has to be a confession is not listed in most US states laws.
Third, you have to look at the law. In some states, it says that the priest cannot be compelled to give testimony, which might mean that if a priest voluntarily provides this information than they are not being compelled to do anything. But in other states like in New York, the law states that a priest shall not give testimony or provide evidence.