I think you are completely missing what I am saying and you also seem to be fallaciously appealing to skepticism (are you a global skeptic [0]?). Sure you can say ‘but there is so much we don’t know’, I’m not arguing we know everything. That is not in any way what I am saying.
I am saying it is pointless to appeal to such things. If we always appealed to skepticism science would never advance because everything would be too unknowable. We get to define what words like consciousness means, so we can intentionally define to be within the realm of scientific inquiry. Most people probably define consciousness outside of scientific realm of inquiry (notions of a soul etc) and that is fine, but at least in the first definition there can be scientific debate.