On the contrary, it’s not a flaw in my argument, it is my argument. I’m saying we can’t be sure a machine could not be conscious because we don’t know that our brain is what makes us conscious. Nor do we know where the threshold is where consciousness arises. It’s perfectly possible all we need is to upload an exact copy of our brain into a machine, and it’d be conscious by default.
My mom does this. Can’t count how many times I’ve been looking for something only to be told by her “I didn’t touch it. I never touch your stuff. You must have lost it.” Only for 3 hours later her to find it and go “Oh right, I moved it here so it’d be easier for you to find it.”