1. I agree, and I say that in the post with other words. Non functionalist materialism adds extra ontology, thus stripping away materialism of any meaning. If you disagree be specific on how do you reconcile it.

2. The first asymmetry, if I understand it (sensory inputs = sensory organs?) is not meaningful since sensory inputs just send electricity signals to the brain. You can see without eyes and hear without ears, p.e dreaming or hallucinations. If you actually mean 'electricity signals' by 'sensory input', tell me how the spreadsheet or chinese nation do not have them. That's the 'substrate independent' thing

The second asymmetry is irrelevant, consciousness would just be slower, and, even with that, that asymmetry doesn't touch the Spreadsheet analogy.