It is not presumptuous at all. Inference to the best explanation is how you know (almost) anything.
- This table isn’t conscious.
This is my justified belief. No inferential claim is guaranteed and all objective claims are inferential (which is why science isn’t absolute).
That said, I have strong reasons to think that tables aren’t conscious. They might be, but I’m epistemically compelled to believe otherwise.
- ChatGPT isn’t conscious.
Ditto. It would be irrational for me to believe otherwise given the strong evidence.
That you “don’t know for sure” is an implied disclaimer for every scientific claim.
If the evidence is ambiguous, we say so. Regarding ChatGPT, the evidence is unambiguous.
- I am conscious.
This is a non-inferential claim that I know through direct contact with reality. It is a priori.