Can we ever prove that someone or something is conscious and not just mimicking consciousness extremely well?
The point is how can you ever verify that two beings react exactly the same to all stimuli? How are you determining "no measurable difference"? Setting aside the fact that silicon is measurably different from neural tissue, you still aren't any closer to answering the question "does the machine experience consciousness the same way I do as a result of its function?"
Let's just pretend that we run all the arguments for and against qualia from that article against each other and declare us all losers in advance.
Now, assuming a large number of tests have been performed and there is a consensus they have no practical difference, why would you conclude that consciousness is not derived from brain structure?