neurons aren't binary. who knows if they're special in a way digital computers can't simulate -- they aren't well understood.
nobody said anything about determinism besides you
Most of the time someone brings up the word 'Digital' they are talking about 1's and 0's, and how everything is known and determined, and thus looses the ineffable human quality.
"they're special in a way digital computers can't simulate"
I might be making a straw man, but you are literally just saying "something magical that exists outside physics must be going on"
But it would be the case that the universe is non-computable, and if this is the case, even without "magic", you would not be able to reproduce certain kinds of things (even not conscious ones) with a computer.