That's true. I suppose it comes down to what exactly is meant by "is computable". I don't think it was defined well enough, which I suppose is to be expected when discussing these topics that involve lots of hand-waving.
I interpreted it to mean that we can predict the outcome of it, you interpret it to mean that we can model it.
Either way, maybe it doesn't matter since the original proposal is that consciousness is a subjective experience and there isn't an obvious way to define how to programmatically create it i.e. compute it.