I had the same problem. My comment:

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"The crucial assumption is that the abstract program, as a mathematical object, requires design and therefore intent. Accordingly, only artificial things can compute. We cannot say, for example, that a brain computes."

I would argue that living things represent the spontaneous emergence of teleology in nature (i.e., evolution doesn't itself have a goal but it implies the greater success of creatures which do have goals). Brains evolved to help organisms survive and reproduce by allowing them to better process sensory data. So brains were "designed" for an "intent" (survival/reproduction), in the sense that brains that did not serve the intent died out.