Exactly!
The LLM just needs to make sure it uses it appropriately. Doing that bit is the non-deterministic part, but the NPV calculation itself is completely deterministic.
This process of deciding what data to put in what column and how to apply NPV to it is non-deterministic. You could choose to put it in column A, or column B or maybe even row 3 - it depends!
The LLM does that part non-deterministically.
Have you ever done anything related to corp finance/valuation in a professional setting? Highly doubt it.