>>536147840
Mentats are very powerful tools, but only as powerful as the information you put into them like any computing device. I think if a mentat had access to other memory (like Paul did, as he was essentially trained as a mentat), they'd would have no issues finding a cure, but without other memory, the knowledge of the disease is only held by the Bene Gesserit who claimed when the Baron tried to force a cure out of them that one didn't even exist anyway.