That evidence does undercut the testes/cooling story as an argument for extremely fast or extraordinary evolutionary change. But I think the more basic problem is that the arguments were advanced without any evidence, indeed without any reported attempt to obtain evidence.
It may very well be that there are aspects of the whale evolution trajectory that are peculiar enough to require extraordinary explanation. For at least some of these aspects, there are available data (genomics, anatomy, paleontology, physiology) that could be analyzed to look for abrupt changes. There are places to publish such analyses, even in progress, to get feedback and critique from other experts. There are lots of scientists who, like me, would be very interested in such work. It doesn’t seem that Sternberg is doing any of it. That’s a shame.