There are in fact two distinct usages of the term "psychophysical parallelism." The original useage was, as the reviewers suggest, the notion that mind and brain operate independently and in parallel without any actual interaction, synchronized by God. But the other usage, of which the reviewers appear unaware, involves a one-to-one correspondence between mind and brain.

Feigl (1958 p. 15) makes this clear with his statement "Parallelism ... is here understood as the assertion of one-one Y - F correspondence, and not, as by Wundt and some philosophers, as the doctrine of double causation i.e. involving parallel series of events with temporal-causal relations corresponding (contemporaneously) to one another on both sides."

But the reviewers are right, it is best to avoid ambiguity when possible, so the term has been removed from the paper.