I don't see anyone pretending that we know consciousness.

However, we are in the process of understanding, and there has yet to be any proof or indication that that process will end before we conquer that knowledge. Given what we already know, and that we're in the infancy of real research in this area, there's every reason to believe that we're going to solve this mystery in the near future.

And it's intellectually cowardice to pretend otherwise.