Yeah, plenty of warnings in there about not using it for numbers.

And also this:

The COPILOT function only has access to data provided through the context arguments. It does not have access to:

Other data from the workbook

So it's optional only in that it won't even look at the spreadsheet when returning the result. I suspect the next 20 years of AI research will be teaching it to say "I'm sorry, Dave. I'm afraid I can't do that" when appropriate.