Some things you need to know about LLMs:

1. They are probabilistic text generators, which look at their training data (in a very abstracted way) and go "based on what's written here, what's most likely to come next?

2. They treat numbers like any other word or phrase

This means, when using them for TTTPGs, they will treat everything like it's 5e, because 5e dominates the discussion, and that any numbers they spit out will only be right by accident.