Did you verify each and every cell of data?

LLMs are concerned with mimicking language and appearance as best they can. You don't know if it's just packaging up a bunch of numbers and a table that looks pretty plausible or if it's actually using some sort of formatting scheme and applying it while strictly preserving the numbers.

And that's part of the inherent problems of AI. It's a black box. You don't know if it's calculating some final report that thinks you want with the numbers it thinks you want or if it's actually applying a constant process to all the numbers, cells and columns of the of the report.

I suppose perhaps if the LLM could provide some sort of processing chain information to you, maybe that would work to alleviate any concerns