So, the key issue is whether or not the representations produced by the paperclip optimizer could have been produced by other processes. If there is another process that produces the paperclip-optimized representations more efficiently than going through the process of humanity, then that process dominates the calculation of D(r).

In other words, for this objection to make sense, it's not enough for the humanity to have been sufficient for the R scenario. It must be necessary for producing R, or at least necessary to result in it in the most efficient possible way.

What are your criteria for a more concrete model than what has been provided?