[MaxBarraclough]

I'm inclined to agree. To put it another way, then: what matters isn't the substrate (neurons vs transistors), but what you do with them.

Going this route, we'd have to say that if you wrote a program that perfectly simulated the human brain, you've built a conscious system running on transistors.

It also means that if you built a RISC-V processor based on a large number of neurons (say, as many as are in a human brain), you haven't built a conscious system, despite that it's neuron-based.

I'm ignoring the obvious problems with building a RISC-V using neurons; they strike me as incidental detail, for our purposes here.