Seems similar enough to "Every part of your brain assumes that all the other surrounding parts work a certain way. The present brain is the Environment of Evolutionary Adaptedness for every individual piece of the present brain.

Start modifying the pieces in ways that seem like "good ideas"—making the frontal cortex larger, for example—and you start operating outside the ancestral box of parameter ranges. And then everything goes to hell.

So you'll forgive me if I am somewhat annoyed with people who run around saying, "I'd like to be a hundred times as smart!" as if it were as simple as scaling up a hundred times instead of requiring a whole new cognitive architecture."

Eliezer Yudkowsky, Growing Up is Hard

Right on.

I'm the blogger PZ was responding to in his post, and I specifically recommended PZ read Sandberg and Bostrom's Whole Brain Emulation: A Roadmap.

That's what PZ is claiming to have read when he writes "I read the paper he recommended," but PZ doesn't seem to have read it very carefully, in particular missing out on the sections "simulation scales" (pp. 13-14), "Body Simulation," and "Environment Simulation" (pp. 74-78). I've written a post explaining PZ's apparent confusions in greater detail at my blog.