I have glanced at the abstract, and I think this is the part that gives you comfort:
Thus, not only the total rate, but also the mutational spectrum, varies among primates. This finding suggests that events in primate evolution are most reliably dated using CpG transitions. Taking this approach, we estimate the human and chimpanzee divergence time is 12.1 million years, and the human and gorilla divergence time is 15.1 million years.
My question goes to the phenotype (the product we call a species). All that I see from a quick look at both your references is that mutations do occur, geneticists have differed on this subject over the past, and now you favour a theory of neutral drift. My glance at your first paper shows me nothing related to the phenotype, and a lot of 'imagine if this occurred', and based on some data we can eliminate some terms, and we arrive at a mutation rate (which means any change in sequence, without any reference to its importance or functional impact).
During the season of good will, I am disinclined to enter into a heated debate - my question is clear enough, and it does not require trolling through the biologist literature base - I have spent (wasted) enough time downloading papers on this area to be satisfied that the question I ask is debated amongst specialists, and I will leave it at that.