Your missing the point about the meaning of 'random'
in the context of this discussion.
Peter Borger considers that the mutations are non-random
because there are areas of the DNA that have a statistically
higher probability of suffering copying errors than others.
He attributes to the term non-random the meaning of deterministic.
Random in the context of evolutionary biology means that we
cannot predict in advance when a mutation will occur, nor
what effect that mutation will have on the organism (if any).
That there is a mechanism that mitigates copy errors is good for
ToE in that it undermines all of the 'mutations are bad' line
of argument (if it needed any undermining!)